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1Back to top Go down   No Brake light K100 1985 Empty No Brake light K100 1985 Sun Aug 09, 2015 9:53 pm

Mumbles

Mumbles
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I'm converting my 85 K100 to a cafe/street fighter. I have LED turn signals and they work great. My problem is my LED rear tail light comes on but when I press the rear brake the light goes out. I have spent to many hours trying to figure out why it won't work. I have a good wiring diagram but I'm missing something.

Can somebody let me know how you wire a LED rear tail light so the brake light works?

Thanks,

Mumbles

    

2Back to top Go down   No Brake light K100 1985 Empty Re: No Brake light K100 1985 Mon Aug 10, 2015 2:37 am

duck

duck
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You can cure this by getting rid of the BMU.  The BMU is the black box on the left side of the relay box right in front of the fuses.  Once you've removed it, short the following wires in the BMU socket:

Short the front brake switch wire(Gray/Red) and the rear brake switch wire(Gray/Green) to the rear brake light(Gray/Yellow.)

Short the tail light power(gray/white) to the tail light wire(Gray/Black)


__________________________________________________
Current stable:
86 Custom K100 (standard fairing, K75 Belly pan, Ceramic chromed engine covers, paralever)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
94 K1100RS
93 K1100LT (x2)
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
98 Taxi Cab K1200RS
14 K1600GT
http://www.ClassicKBikes.com
    

3Back to top Go down   No Brake light K100 1985 Empty Still no LED rear brake light Mon Aug 17, 2015 5:56 pm

Mumbles

Mumbles
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@duck wrote:You can cure this by getting rid of the BMU.  The BMU is the black box on the left side of the relay box right in front of the fuses.  Once you've removed it, short the following wires in the BMU socket:

Short the front brake switch wire(Gray/Red) and the rear brake switch wire(Gray/Green) to the rear brake light(Gray/Yellow.)

Short the tail light power(gray/white) to the tail light wire(Gray/Black)

Duck,

I did what you said but no change. My tail light works but when I put on my front or rear brake the tail light goes out.

This is the only thing keeping me from riding so I'm very frustrated right now.Embarassed

    

4Back to top Go down   No Brake light K100 1985 Empty Re: No Brake light K100 1985 Tue Aug 18, 2015 1:04 am

kioolt

kioolt
Silver member
Silver member
By you saying you are converting it to a café racer I'm getting that you have done some rewiring in addition to the led bulb.  If memory serves me correctly the original tail and brake light were separate bulbs.  When you installed the led bulb did you use one that is a single unit?  Did you remember to hook up the brown ground wire?


__________________________________________________
2004 R1150RT 186,800 miles 
1991 K100LT 128,700 miles
1982 R100RT 106,900 miles
Total 422,400 BMW miles

AMA,BMWRA,BMWMOA


The cheapest thing on a BMW is the nut that connects the handlebars to the seat.
    

5Back to top Go down   No Brake light K100 1985 Empty Re: No Brake light K100 1985 Tue Aug 18, 2015 3:27 am

Mumbles

Mumbles
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@kioolt wrote:By you saying you are converting it to a café racer I'm getting that you have done some rewiring in addition to the led bulb.  If memory serves me correctly the original tail and brake light were separate bulbs.  When you installed the led bulb did you use one that is a single unit?  Did you remember to hook up the brown ground wire?
Yes my tail light is a one bulb for both tail and brake light. I never thought about a single led being a problem. I did try grounding the light straight to frame and also to the brown wire. Neither worked. So I need a dual bulb led?

    

6Back to top Go down   No Brake light K100 1985 Empty Re: No Brake light K100 1985 Tue Aug 18, 2015 3:31 am

kioolt

kioolt
Silver member
Silver member
Can you post the wiring diagram you used and also the information on the bulb you are using?  I may be able to help.


__________________________________________________
2004 R1150RT 186,800 miles 
1991 K100LT 128,700 miles
1982 R100RT 106,900 miles
Total 422,400 BMW miles

AMA,BMWRA,BMWMOA


The cheapest thing on a BMW is the nut that connects the handlebars to the seat.
    

7Back to top Go down   No Brake light K100 1985 Empty Re: No Brake light K100 1985 Tue Aug 18, 2015 6:06 am

Mumbles

Mumbles
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active member
@kioolt wrote:Can you post the wiring diagram you used and also the information on the bulb you are using?  I may be able to help.
I don't have a wiring diagram but here is what I have done.

LED light = White (tail light)
                  Red (brake)
                  Black (ground)

BMW wires = Grey/Black (tail light)
                    Grey/Yellow (brake)
                    Brown (ground)

I hooked LED white to BMW Grey/Black, LED Red to BMW Grey/Yellow. I tried the ground two ways, one was LED black straight to frame. When that didn't work I hooked the BMW Brown wire to the LED Black. That didn't work either.

LED Light is just a cheap eBay item, one LED circuit card in one lens. Brake and tail light are the same LED.

    

8Back to top Go down   No Brake light K100 1985 Empty Re: No Brake light K100 1985 Tue Aug 18, 2015 6:24 am

kioolt

kioolt
Silver member
Silver member
It looks like you are hooking it up correctly.  I suggest that you try hooking up the LED outside of the bike to see if it will works correctly. 

First try 12 + on white - ground on black
Then try 12 + on red - ground on black
Then lastly try 12 + on red and white and ground on black


__________________________________________________
2004 R1150RT 186,800 miles 
1991 K100LT 128,700 miles
1982 R100RT 106,900 miles
Total 422,400 BMW miles

AMA,BMWRA,BMWMOA


The cheapest thing on a BMW is the nut that connects the handlebars to the seat.
    

9Back to top Go down   No Brake light K100 1985 Empty Re: No Brake light K100 1985 Tue Aug 18, 2015 9:45 am

Holister

Holister
Life time member
Life time member
I think??....

White = ground
Red = brake
Black = tail


__________________________________________________

1989 K100RT     VIN  0097367 (naked)  
1996 K1100RS   VIN  0451808
  No Brake light K100 1985 Austra12    Fuel:  95 Octane
Engine Oil: Nulon Full Synthetic 15W50
Gear Box Oil:  Nulon Synthetic 75W90
    

10Back to top Go down   No Brake light K100 1985 Empty Re: No Brake light K100 1985 Tue Aug 18, 2015 11:33 am

Dai

Dai
Life time member
Life time member
What KH says. For some very unknown reason the LEDs inside computers used white for earth and this 'convention' seems to have escaped to the outside world.


__________________________________________________
1983 K100 upgraded to K100RS spec, 1987 K100RT
Others...
1978 Moto Guzzi 850-T3, 1979 Moto Guzzi 850-T3 California,1993 Moto Guzzi 1100ie California
2020 Royal Enfield Bullet 500
    

11Back to top Go down   No Brake light K100 1985 Empty Re: No Brake light K100 1985 Tue Aug 18, 2015 12:54 pm

kioolt

kioolt
Silver member
Silver member
White is the ground wire on trailer wiring.


__________________________________________________
2004 R1150RT 186,800 miles 
1991 K100LT 128,700 miles
1982 R100RT 106,900 miles
Total 422,400 BMW miles

AMA,BMWRA,BMWMOA


The cheapest thing on a BMW is the nut that connects the handlebars to the seat.
    

12Back to top Go down   No Brake light K100 1985 Empty Re: No Brake light K100 1985 Wed Aug 19, 2015 1:36 am

Mumbles

Mumbles
active member
active member
Good input on the white being ground on the LED light. I tried that and now I have a good brake light.Very Happy But now I have no tail light. Mad I think what I thought was a tail light being on before was actually the brake light. 

I switched the wires around every way possible but could only get the brake light to work. Boy, how can three wires be so frustrating?

    

13Back to top Go down   No Brake light K100 1985 Empty Re: No Brake light K100 1985 Wed Aug 19, 2015 1:44 am

kioolt

kioolt
Silver member
Silver member
I think you need to buy a different bulb.


__________________________________________________
2004 R1150RT 186,800 miles 
1991 K100LT 128,700 miles
1982 R100RT 106,900 miles
Total 422,400 BMW miles

AMA,BMWRA,BMWMOA


The cheapest thing on a BMW is the nut that connects the handlebars to the seat.
    

14Back to top Go down   No Brake light K100 1985 Empty Re: No Brake light K100 1985 Wed Aug 19, 2015 7:34 am

Holister

Holister
Life time member
Life time member
Have a look at your front parking light.... its probably not working also.
I'd say your #2 fuse is blown or not making proper contact.


__________________________________________________

1989 K100RT     VIN  0097367 (naked)  
1996 K1100RS   VIN  0451808
  No Brake light K100 1985 Austra12    Fuel:  95 Octane
Engine Oil: Nulon Full Synthetic 15W50
Gear Box Oil:  Nulon Synthetic 75W90
    

15Back to top Go down   No Brake light K100 1985 Empty Re: No Brake light K100 1985 Thu Aug 20, 2015 7:33 am

Mumbles

Mumbles
active member
active member
The fuse is good. I have a aftermarket front head light so I don't have a parking light. Both my high and low beams work though.

This has really been a trying time. I thought I had it with the whole white is ground. I was so happy to see the tail light finally work. I still can't ride it to work as I leave when it is still dark. I really want to figure this out. Summer is ticking by.Sad

    

16Back to top Go down   No Brake light K100 1985 Empty Re: No Brake light K100 1985 Thu Aug 20, 2015 8:04 am

Holister

Holister
Life time member
Life time member
OK.... here are some options to try.


  1. How do you know the fuse is good? They can look ok but are dud. Put a meter on it to be sure.
  2. Do you have power to the fuse holder? Fuse #2 is fed direct from the ignition sw. on the grey wire. Front park and tail light are the only things on that circuit. Test = DMM @20Vdc range, fuse +terminal to earth, ignition/park sw on.
  3. Do you have continuity from fuse #2 to the tail light? Remove the bulb
  4. Is there an earth short on that circuit? Remove the bulb
  5. Do both LEDs bench test ok?


There's always a logical explanation  :suspect:

EDIT:
Re point 2... probably better to just test for 12V at the tail light connection. If no volts,

  • the fuse or fuse holder is dud,
  • the ignition sw is not connecting that circuit,
  • you've got a short or
  • the BMU is faulty


__________________________________________________

1989 K100RT     VIN  0097367 (naked)  
1996 K1100RS   VIN  0451808
  No Brake light K100 1985 Austra12    Fuel:  95 Octane
Engine Oil: Nulon Full Synthetic 15W50
Gear Box Oil:  Nulon Synthetic 75W90
    

17Back to top Go down   No Brake light K100 1985 Empty Re: No Brake light K100 1985 Fri Aug 21, 2015 3:06 am

Mumbles

Mumbles
active member
active member
I put my volt meter on the #2 fuse and got 11.8 volts so the fuse and fuse box is ok. I then put the meter on the tail light connection and got 6.75 volts? I put it on the brake light connection and it had 11.8 volts.

What does the 6.75 volts mean on the tail light connection?

It's a led tail and brake light combination.

    

18Back to top Go down   No Brake light K100 1985 Empty Re: No Brake light K100 1985 Fri Aug 21, 2015 3:25 am

robmack

robmack
Life time member
Life time member
So, earlier in the thread, Duck suggested shorting together some wires to bypass the BMU and you confirmed that you had done this. Big question -- did you remove the BMU from the socket before making the wiring changes? Because you may be getting this strange behaviour if you still have the BMU plugged in.

Have you been consulting these guides?
http://www.motobrick.com/index.php?topic=331.0
http://www.motobrick.com/index.php?topic=906.0


__________________________________________________
Robert
1987 K75 @k75retro.blogspot.ca
http://k75retro.blogspot.ca/
    

19Back to top Go down   No Brake light K100 1985 Empty Re: No Brake light K100 1985 Fri Aug 21, 2015 6:58 am

Mumbles

Mumbles
active member
active member
No I took the BMU out and took the circuit board off and made the jumpers on the connectors and plugged it back in according to Duck's second option in the first link you listed.

    

20Back to top Go down   No Brake light K100 1985 Empty Re: No Brake light K100 1985 Fri Aug 21, 2015 8:39 am

Holister

Holister
Life time member
Life time member
@Mumbles wrote:I put my volt meter on the #2 fuse and got 11.8 volts so the fuse (depends which side you measured from) and fuse box is ok. I then put the meter on the tail light connection and got 6.75 volts? I put it on the brake light connection and it had 11.8 volts.

What does the 6.75 volts mean on the tail light connection?
That voltage is a bit strange. Did you take the LED out?

It's a led tail and brake light combination.
All I would've done is apply jumpers to the BMU holder/socket.
Red is brake switches to brake light.
Yellow is power (fuse#2) to tail light.
No Brake light K100 1985 Bmu11

What did you do with the wire to the front parking light?
Any other wiring been modified?


__________________________________________________

1989 K100RT     VIN  0097367 (naked)  
1996 K1100RS   VIN  0451808
  No Brake light K100 1985 Austra12    Fuel:  95 Octane
Engine Oil: Nulon Full Synthetic 15W50
Gear Box Oil:  Nulon Synthetic 75W90
    

21Back to top Go down   No Brake light K100 1985 Empty Re: No Brake light K100 1985 Sat Aug 22, 2015 12:04 am

Mumbles

Mumbles
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active member
Your jumpers match what I did. I did not remove the led. I thought the voltage was strange also. 

I took off the the original head light, turn signals, tail light and instrument cluster. I put on led turn signals front and back and they work fine. Head light works fine also. I put a digital speedo (Vipor) on it. So far everything works that I want to work except that tail light.

The wire for the old head light parking light is just hanging. I measured the voltage rom the outside of the fuse.

    

22Back to top Go down   No Brake light K100 1985 Empty Re: No Brake light K100 1985 Sat Aug 22, 2015 12:26 am

robmack

robmack
Life time member
Life time member
There is some resistance in series with the tail light circuit that is causing the voltage drop of ~6V.  Obviously a12V LED will not function if supplied 6V so you have to find where that voltage is dropping.  There is a connector at the rear into which the tail light assembly plugs. Unplug it and test voltage between Grey/Black and ground.  If it's 6V, then the drop is further up the line. If it measures 12V, the problem is in the tail light assembly.

Unplug your shorting plug and test resistance between Grey/Black and ground (with the rear tail light assembly still disconnected).  It should be infinite.  If not, there is a low-resistance short somewhere along that wire, possibly inside the harness.  Examine the harness for damage along its length.  If you're unable to find any damage, then the problem might be in the harness itself. If you get to this point, maybe it's time to pull the Grey/White parking light wire towards the rear and use it to power the rear tail light (ignore the grey/black wire).


__________________________________________________
Robert
1987 K75 @k75retro.blogspot.ca
http://k75retro.blogspot.ca/
    

23Back to top Go down   No Brake light K100 1985 Empty Re: No Brake light K100 1985 Sat Aug 22, 2015 2:43 am

Holister

Holister
Life time member
Life time member
@Mumbles wrote:Your jumpers match what I did. I did not remove the led. I thought the voltage was strange also. 
You need to remove the LED or disconnect the connector to properly measure the tail voltage. Follow robmack's instructions.
Seeing as the voltage was measured with the bulb in place what you have measured is the voltage drop across the LED.
LEDs can be dimmed with a resistor and I suspect that's how this single LED tail/stop works which confirms the use of a drop resistor in the light fitting on the tail light circuit and why you're getting 6.75V.
I'm starting to think the LED itself may be faulty.


I took off the the original head light, turn signals, tail light and instrument cluster. I put on led turn signals front and back and they work fine. Head light works fine also. I put a digital speedo (Vipor) on it. So far everything works that I want to work except that tail light.

The wire for the old head light parking light is just hanging. I measured the voltage rom the outside of the fuse. That tells you there's power to the fuse holder only depending on which side of the fuse you measured from. The only definative test for a fuse is to take it out and check continuity across the spades. However, you have a voltage at the tail so I'd say the fuse is intact.


__________________________________________________

1989 K100RT     VIN  0097367 (naked)  
1996 K1100RS   VIN  0451808
  No Brake light K100 1985 Austra12    Fuel:  95 Octane
Engine Oil: Nulon Full Synthetic 15W50
Gear Box Oil:  Nulon Synthetic 75W90
    

24Back to top Go down   No Brake light K100 1985 Empty Re: No Brake light K100 1985 Sun Aug 23, 2015 12:19 am

Holister

Holister
Life time member
Life time member
An easy test would be to just swap the brake and tail wires (red and black) from the LED.
If the tail light doesn't light up, you have a short. If it does light, the LED is dud.


__________________________________________________

1989 K100RT     VIN  0097367 (naked)  
1996 K1100RS   VIN  0451808
  No Brake light K100 1985 Austra12    Fuel:  95 Octane
Engine Oil: Nulon Full Synthetic 15W50
Gear Box Oil:  Nulon Synthetic 75W90
    

25Back to top Go down   No Brake light K100 1985 Empty Re: No Brake light K100 1985 Sun Aug 23, 2015 3:43 am

Mumbles

Mumbles
active member
active member
I disconnected the lead to the tail light and put the volt meter on it. It read the 6 volts so per what Robmack stated that means there is a short up the line. Right?

I then switched the tail light and brake light wires and the light wouldn't come on at all. So that means I have a short per KH. Right?

Like Robmack stated, I ran a wire from the white/grey parking light wire up front back to the tail light connection. The light still did not come on. The brake only comes on when I have both the connections plugged in. I tried the parking light wire to the tail both ways with the normal connections plugged in and with the tail light wire not connected only connected with the parking light wire. No tail light still either way. 

I'm going crazy. This should be easy.

    

26Back to top Go down   No Brake light K100 1985 Empty Re: No Brake light K100 1985 Sun Aug 23, 2015 10:04 am

Holister

Holister
Life time member
Life time member
Correct... both tests indicate something amiss upstream. 6V is indicating there's a resistance somewhere from the fuse (11.8V) to the tail connector (6V). There may be a short involved but not necessarily.

With the BMU/jumper in place, ignition sw completely off, fuse #2 inplace, LED removed, set DMM to ohms scale and measure...

  1. From the right side of the #2 fuse holder (see 2 tiny square holes just above the fuse) to the tail light connector. A good reading will be around 0.5Ω, otherwise...
    - I'm assuming you soldered the jumper wires?? Could be a dry solder. Measure accross the outside pins.
    - That just leaves the fuse. You need to measure the resistance on that to be sure. It could more likely be corroded fuse/holder contacts. This is a known problem with other issues. With the fuse inplace, stick your DMM probes into the 2 tiny square holes just above the fuse. You should get less than 0.5Ω

  2. If that checks out OK... with the fuse-to-tail wire still isolated, measure the resistance from the tail light connector to the negative terminal on the battery. That will tell you if the tail light wire is shorting to earth. A good reading will be infinity. Robmack already detailed this test, but running the park light wire to the rear as you did, does not conclusively rule out an earth short.

  3. If that checks out OK... with the brake off, measure the resistance from the tail light connector to the brake light connector. That will tell you if the wire is shorting to the brake light wire. They are cabled together from the BMU back along the R/H side of the frame just below the seat. A critical point is where it passes by the rear shockie bolt.


Have you bench tested the LED? Would be good to know that the tail light does actually light up when 12V is applied. I can't read anywhere where you mention this. Easy way to do this is to connect the earth connector to the white wire and run a test lead from the +battery and apply to the red and black wire one at a time.


__________________________________________________

1989 K100RT     VIN  0097367 (naked)  
1996 K1100RS   VIN  0451808
  No Brake light K100 1985 Austra12    Fuel:  95 Octane
Engine Oil: Nulon Full Synthetic 15W50
Gear Box Oil:  Nulon Synthetic 75W90
    

27Back to top Go down   No Brake light K100 1985 Empty Re: No Brake light K100 1985 Wed Aug 26, 2015 4:53 am

Mumbles

Mumbles
active member
active member
Im losing my mind:x  I had the tail attached to my cafe seat pan which makes it hard to see it when I have it hanging off the side so I can get to the wires which are up under the rear portion of the seat pan when in is in place. Tonight I took the light off the pan so I could put it up loose by the wires and really get to it easier and see it from the top. When I tried to test the LED like you said (KH) the light doesn't light up at all on either wire. I did have it grounded with the white wire.

When I hook it back up to the BMW wires it comes on with the brake light red wire (and pressing the brake pedal) but not the tail light black wire. When the brake light comes on only about half of the LEDs are lit up. That tells me that it probably is the tail light and not the brake light but it will not come on as the tail light on black wire only the red.

Should I just replace this light with something different? It's got to be the led.

    

28Back to top Go down   No Brake light K100 1985 Empty Re: No Brake light K100 1985 Wed Aug 26, 2015 11:59 am

Holister

Holister
Life time member
Life time member
The bulb could be faulty but to be honest, you've not confirmed the integrity of the wiring yet. With 6.75V on the tail light scratch (post #17) and some seemingly strange behaviour I'm tending towards the wiring being faulty.


__________________________________________________

1989 K100RT     VIN  0097367 (naked)  
1996 K1100RS   VIN  0451808
  No Brake light K100 1985 Austra12    Fuel:  95 Octane
Engine Oil: Nulon Full Synthetic 15W50
Gear Box Oil:  Nulon Synthetic 75W90
    

29Back to top Go down   No Brake light K100 1985 Empty Re: No Brake light K100 1985 Wed Aug 26, 2015 9:06 pm

Mumbles

Mumbles
active member
active member
KH, your right, but as you have probably figured out by now I'm not an electrical expert. I just don't understand why I couldn't get the light to come at all bench testing it but it does when I connected it to wiring harness.

I'll try run through the other checks tonight although when I read them they seem to be over my head a little.

    

30Back to top Go down   No Brake light K100 1985 Empty Re: No Brake light K100 1985 Thu Aug 27, 2015 2:54 am

Mumbles

Mumbles
active member
active member
Kaptain Holister wrote:Correct... both tests indicate something amiss upstream. 6V is indicating there's a resistance somewhere from the fuse (11.8V) to the tail connector (6V). There may be a short involved but not necessarily.

With the BMU/jumper in place, ignition sw completely off, fuse #2 inplace, LED removed, set DMM to ohms scale and measure...

  1. From the right side of the #2 fuse holder (see 2 tiny square holes just above the fuse) to the tail light connector. A good reading will be around 0.5Ω, otherwise...I get 0.0
    - I'm assuming you soldered the jumper wires?? Yes Could be a dry solder. Measure accross the outside pins. I get 0.0 there also.
    - That just leaves the fuse. You need to measure the resistance on that to be sure. It could more likely be corroded fuse/holder contacts.The contacts and fuse look brand new. Bike only has 3,000 miles on it.  This is a known problem with other issues. With the fuse inplace, stick your DMM probes into the 2 tiny square holes just above the fuse. You should get less than 0.5Ω  I get 0.0 there as well. The lowest ohms setting on my volt meter 20 and starts with a 1. then when I make the connect it starts about 3 and goes down to o.

  2. If that checks out OK... with the fuse-to-tail wire still isolated, measure the resistance from the tail light connector to the negative terminal on the battery. The meter doesn't even change when I did this on either the black or red tail light wires or the wiring harness gray/yellow or gray/black. That will tell you if the tail light wire is shorting to earth. A good reading will be infinity. Robmack already detailed this test, but running the park light wire to the rear as you did, does not conclusively rule out an earth short.

  3. If that checks out OK... with the brake off, measure the resistance from the tail light connector to the brake light connector. The meter doesn't change on either wires here either. That will tell you if the wire is shorting to the brake light wire. They are cabled together from the BMU back along the R/H side of the frame just below the seat. A critical point is where it passes by the rear shockie bolt.


Have you bench tested the LED? I did and neither brake or tail light would eliminate. I put it back on the wiring harness and it will light only half the LEDs if both the white and red wires are hooked up. Would be good to know that the tail light does actually light up when 12V is applied. I can't read anywhere where you mention this. Easy way to do this is to connect the earth connector to the white wire and run a test lead from the +battery and apply to the red and black wire one at a time.
I don't know if am doing the tests correct to be getting no readings. I so appreciate your help but I feel like I'm getting nowhere. Crying or Very sad

    

31Back to top Go down   No Brake light K100 1985 Empty Re: No Brake light K100 1985 Thu Aug 27, 2015 5:42 am

Holister

Holister
Life time member
Life time member
Those results are good.
Don't know why you were getting 6.75V at the tail light... must've been a bad reading.
And why the bulb doesn't bench test when the brake light works in the harness is a bit of a mystery.

Would be worth checking that you have continuity from the earth connection (brown wire) to the negative terminal of the battery. Same as test 2 above but from the earth connector at the tail. You should get 0.5Ω or less.

Time to try another bulb. Do you have a link to that LED you bought?


__________________________________________________

1989 K100RT     VIN  0097367 (naked)  
1996 K1100RS   VIN  0451808
  No Brake light K100 1985 Austra12    Fuel:  95 Octane
Engine Oil: Nulon Full Synthetic 15W50
Gear Box Oil:  Nulon Synthetic 75W90
    

32Back to top Go down   No Brake light K100 1985 Empty Re: No Brake light K100 1985 Thu Aug 27, 2015 3:13 pm

Mumbles

Mumbles
active member
active member
I tried swapping the wires on the tail light with the wires on the wiring harness several times. It only light the one way (brake wire on the wiring harness) and only half the LED lights come on and since it is suppose to be the brake light I would think all the LEDs would come on. That's why I kind of thought the LED light is suspect.

That LED is just a cheap Chinese product. I bought one for a BSA bobber I did and it worked fine on that. I guess I should try a different LED. maybe all this hassel and hours I've gone through is for nothing and it's been the LED light all along.

It's worth a try with all the info you have giving me. I'll get something else and let you know how it goes. Thanks so much for all you efforts in helping me KH.

    

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