BMW K bikes (Bricks)

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MT350Explorer

MT350Explorer
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Guys,

Electrical cretin needs help.

I have added two strips of LED's to supplement the existing brake light. I soldered these direct to the positive and negative of the brake light bulb holder (see photo). They work. However the fuse for the sidelights has now blown when I started the bike up. No back light and no front pilot light. I changed the fuse and it did it again. What I have done?

What I have I screwed up with LED fitting? 04910


Thanks Very Happy
Dave


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1991 K100 RS 16 valve
    

twincarb

twincarb
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It could be that your now drawing to much current with the LED light strips in there as well.

You could remove the brake bulb and switch the lights off. Then replace the fuse and switch the ignition on. Touch the brake and see if it blows.

I have also seen fuse's blow when bubs have been on there way out! It took me a couple of days of head scratching to figure that out!


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BMW K100LT 1988 Matt Black Peugeot Electra Blue (ELX) Colour is now confirmed...
Yamaha Thundercat
Triumph Spitfire (not a bike but hell it's British chaps)
What I have I screwed up with LED fitting? 169042 What I have I screwed up with LED fitting? 169034
    

MT350Explorer

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Thanks twincarb mate.

I have LEDs on the front of the bike linked to the parking light circuit so maybe the sum of the LEDS is too much? The fuse is a 15 amp, will I risk damaging the circuit if I increase this to say 30?

Dave


__________________________________________________
1991 K100 RS 16 valve
    

Halo

Halo
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Hi great work looks very well done, does the LED strips have a resistor built in (just look at module (photo available ?), else current will need very high and you will blow the leds
Halo


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84 K100RS 0014803
93 FZR1000 EXUP
    

sidecar paul

sidecar paul
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No Dave,
Don't do that. The stop light will only take about 1¾ Amps and your LED's no more than ¼ Amp, so your 15 Amp fuse is more than plenty.

Try disconnecting the the two leads from the rear light and see if the problem still occurs. That will show if the problem is with your modified rear light/led cluster or somewhere in the wiring to the rear light.
It does sound strange that it only happens when the engine is started though.

Paul.


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'84 K100RS (0014643) (owned since '85), 86 K100RS (0018891) with Martello sidecar (built as an outfit in '88),
'51 Vincent (since '67),'72 Montesa Cota (from new), '87 Honda RS125R NF4 (bought 2015) 
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twincarb

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I agree with not increasing the fuse value.

Could the Bulb Monitoring Unit cause any weird problems like this?


__________________________________________________
BMW K100LT 1988 Matt Black Peugeot Electra Blue (ELX) Colour is now confirmed...
Yamaha Thundercat
Triumph Spitfire (not a bike but hell it's British chaps)
What I have I screwed up with LED fitting? 169042 What I have I screwed up with LED fitting? 169034
    

Ed

Ed
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Interesting that you are increasing the illumination of your rear end.
is it because you find the taillight is too dim?

My wife was following me on the recent weekend ride , and she commented on the lack of light factor.
is this common for other K owners?


__________________________________________________
1993 K1100RS  0194321         Colour #690 Silk Blue  aka " Smurfette"
2018 Kart upgrade.
What I have I screwed up with LED fitting? 10_x_110
    

MT350Explorer

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Thanks guys. I disconnected the rear LEDs so the rear light wirting was as OEM, then switched on the fronyt LEDs using a switch I'd fitted to the dash to manually turn them on/off and pfft! another fuse gone. So, I think something I've done in the FRONT LED wiring is to blame. The front LEDs and their switch were working fine but I think this might be the problem so need to check all the wiring up front.

Appreciate the input, thanks.

Need to order some 15 amp fuses now.... Very Happy

Cheers
Dave


__________________________________________________
1991 K100 RS 16 valve
    

K-BIKE

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Hi although it is a thread hijack I will respond to groverK take a look at the bulb you have in there many people go to a garage and buy/fit the 21/5 watt bulb whereas it is supposed to be a 21/10 watt unit that makes it brighter by far, also bad connections play havoc with brightness.

Back to the original question now you have found it is the front follw a logic path disconnect the stuff you have just put on does the fuse still blow? I suspect it will not, then check the front LED strip is intended for 12 volt use? LED strips are polarity sensitive they must be the correct way round, Red to + and black to - if they are not coloured look to see if the instructions talk about which wire is + and which is - remember on the K wiring scheme brown is earth.
Regards,
K-BIKE

    

MT350Explorer

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groverK wrote:Interesting that you are increasing the illumination of your rear end.
is it because you find the taillight is too dim?

My wife was following me on the recent weekend ride , and she commented on the lack of light factor.
is this common for other K owners?

Compared to modern machines the braking light does not seem very bright. Many have decided to upgarde with LED's mate.

Cheers
Dave


__________________________________________________
1991 K100 RS 16 valve
    

MT350Explorer

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@K-BIKE wrote:
Back to the original question now you have found it is the front follw a logic path disconnect the stuff you have just put on does the fuse still blow? I suspect it will not, then check the front LED strip is intended for 12 volt use? LED strips are polarity sensitive they must be the correct way round, Red to + and black to - if they are not coloured look to see if the instructions talk about which wire is + and which is - remember on the K wiring scheme brown is earth.
Regards,
K-BIKE

Thanks mate, yes it is in the front for sure, irritating because it was all working and is soldered and shrinkwrapped. The LED's are all 12 volt and polarity is correct - the latter has to be for them to illuminate and I tested all with a meter. Thanks for the thoughts, my money is on the switch I fitted as it is very small and the plastic body got melted a bit in my soldering efforts - it could be shorting. We shall see...


Cheers
Dave


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1991 K100 RS 16 valve
    

MT350Explorer

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Sorted now thanks Guys. I removed the switch from the front LEDs, soldered the tails together, shrink wrapped them and it all works perfectly. Just coincidence that the switch started to malfunction when I fitted the rear LEDs. New and more robust (I hope) switch on order.

Cheers
Dave


__________________________________________________
1991 K100 RS 16 valve
    

charlie99

charlie99
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yay .. a win dave

on auto gear it is often well advised to get something ruged and bullit - clutz proof ...if you get my meaning





yes grover the rear lighting is not real good .....we have discussed additional lamps on the rear of the bike before ...and is a great suggestion for safety ..in my opinion ,,,bert (crazy frog had some great ideas iand implementation ...on the rear mudguard .. and i guess many others have thoughts on this as well


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cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%OWhat I have I screwed up with LED fitting? Au-log10

'86 k100 rs.. #######..  "Fred " (f(rame) red ) ( Fredrick leichtundschnell ) - -
bits and pieces from many kind friends across the k100 world ...with many thanks ..
    

MT350Explorer

MT350Explorer
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Yeah Charlie, it's difficult to tell what you're getting online and there's a lot of crap about. I would fit a beemer rocker switch to the pad but the slots are all taken now the grips are fitted.
Cheers
Dave


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1991 K100 RS 16 valve
    

K-BIKE

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Well done Dave a great result.
Regards,
K-BIKE

    

blaKey

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I've done a plug-n-play tail light upgrade using this.

I've taken some photos and I'll do a write-up soon.


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Neil
K100RS 1986 RED!

Dress for the ride and the potential slide.
    

88

88
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Good work Dave, I've had that experience with bulb/fuse when I did my upgrade , completely forgot in until now. Re the front led strip mine was wired off the parking lamp bulb feed so was on the ignition switch.

88



Last edited by 88 on Wed Jul 24, 2019 11:48 am; edited 1 time in total


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What I have I screwed up with LED fitting? Ir-log11 88....May contain nuts!What I have I screwed up with LED fitting? Ir-log11

"The world is a book and those who do not travel read only one page." - St. Augustine from 1600 years ago & still true!

Bike: K100LT 1988. 0172363. AKA the Bullion Brick! Mods: k1100 screen and stands.
K1: 1990. 6374189. Custom Stealth Black paint.
    

charlie99

charlie99
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@blakey wrote:I've done a plug-n-play tail light upgrade using this.

I've taken some photos and I'll do a write-up soon.


good one blakey ...that is a fine kit ...cant wait to see it ...cheers


__________________________________________________
cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%OWhat I have I screwed up with LED fitting? Au-log10

'86 k100 rs.. #######..  "Fred " (f(rame) red ) ( Fredrick leichtundschnell ) - -
bits and pieces from many kind friends across the k100 world ...with many thanks ..
    

MT350Explorer

MT350Explorer
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Just coming back to the culprit in all this - the dodgy switch for the front DRLs that I have addded a switch to so I can turn them off at night. I got a new, different, waterproof switch that lights up - fancy Wink, it even came with a wiring diagram. Can someone who knows about electrickery advise please?

What I have I screwed up with LED fitting? Switch10

I am thinking the red +ve is the red +ve that feeds the DRLs. This becomes switched. My question is do I need to find then a second live to feed the switch illuminating light from somewhere? The sidelight feeds the DRLs so aybe a +ve spur from the headlight?

Thanks for the confirmation
Cheers
Dave


__________________________________________________
1991 K100 RS 16 valve
    

Inge K.

Inge K.
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When the switch is in the on position, it would be illuminated....when 2 & 4 is bridged.


__________________________________________________
Inge K.
K100RS -86. (first owner), K1100LTSE -94.
    

MT350Explorer

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OK I see Inge, so just the DRL positive and the bridge. I understand.

Hope all is well in Norway.

Cheers
Dave


__________________________________________________
1991 K100 RS 16 valve
    

Inge K.

Inge K.
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What I have I screwed up with LED fitting? 112350


__________________________________________________
Inge K.
K100RS -86. (first owner), K1100LTSE -94.
    

Crazy Frog

Crazy Frog
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@Inge K. wrote:When the switch is in the on position, it would be illuminated....when 2 & 4 is bridged.

Here is a quick schematic of the internal switch.
What I have I screwed up with LED fitting? Switch11


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What I have I screwed up with LED fitting? Frog15What I have I screwed up with LED fitting? Logo2101986 k75, 1985 K100rt, 1985 K100rt/EML GT2 sidecar, 1999 K1200lt/Hannigan Astro Sport sidecar.
    

MT350Explorer

MT350Explorer
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Great picture Bert.

I don't want to labour this (but I'm going to Smile!)

Where does the negative (1) feed come from?

If 3 is the positive feed to the DRLs is 1 a spur from the negative feed to the DRLs?

Cheers
Dave


__________________________________________________
1991 K100 RS 16 valve
    

twincarb

twincarb
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negative (1) any earth point

3 is the permanent live from the battery probably through the ignition switch/headlight switch.


Just remember that all earths go back to the same point (brown on our wiring)

The earth from the DRL's also need to head back to an earth point no particular one as long as its potential is to earth.


__________________________________________________
BMW K100LT 1988 Matt Black Peugeot Electra Blue (ELX) Colour is now confirmed...
Yamaha Thundercat
Triumph Spitfire (not a bike but hell it's British chaps)
What I have I screwed up with LED fitting? 169042 What I have I screwed up with LED fitting? 169034
    

Crazy Frog

Crazy Frog
admin
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@MT350Explorer wrote:Where does the negative (1) feed come from?

You can pickup the negative anywhere on the frame but I personally like to have all of them in the same area. I am connecting all my extra negative (ground in NA, Earth in UK Very Happy ) on the frame under the gas tank.

If I need unswitched positive, I plug it on the starter relay (on the lead going straight to the battery.) From there, I go to a fuse and then to the device that I want to power.

The reasoning of this wiring is that I don't want to have extra connections on the battery which may lead to mistakes if you ever have to remove the battery from the bike.

CF


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What I have I screwed up with LED fitting? Frog15What I have I screwed up with LED fitting? Logo2101986 k75, 1985 K100rt, 1985 K100rt/EML GT2 sidecar, 1999 K1200lt/Hannigan Astro Sport sidecar.
    

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