BMW K bikes (Bricks)

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1Back to top Go down   Headlight trouble Empty Headlight trouble on Sat Jan 02, 2016 1:12 am

DaleRT

DaleRT
Silver member
Silver member
Hi, When the headlight is on & you switch to Hi beam or Flash/Pass the headlight dims - Ideas?
   Cheers   Dale

    

2Back to top Go down   Headlight trouble Empty Re: Headlight trouble on Sat Jan 02, 2016 1:22 am

Point-Seven-five

Point-Seven-five
Life time member
Life time member
Assuming the low beam is unaffected I would think it is probably a bad connection somewhere in the hi beam wiring.

Could be in the handlebar switch, the big connector under the tank, or the connection at the bulb.  Might even be a dying bulb, although they usually get brighter just before they burn out.  Possible, but not likely, the ground connection under the tank is dirty.

I would go for the connection at he bulb first and work my way back to the switch.


__________________________________________________
Present:
1994 K75RT
1991 K100RS
1988 K100RS SE

Past:
1994 BMW K75S
1992 BMW K100RS
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

3Back to top Go down   Headlight trouble Empty Re: Headlight trouble on Sat Jan 02, 2016 1:51 am

charlie99

charlie99
VIP
VIP
+1

sounds like the earth wire connection at the bulb to me ....the h4 plastic connection there have been seen to have been distorted from heating effects on many occasions
hint check the wattage of the bulb
supposed to be 55-60 ...but many install higher wattage types

just a heads up
there are many posts in the forum about upgrading to relays ...to alleviate switch and connector issues

good luck


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

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%OHeadlight trouble 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 ..
    

4Back to top Go down   Headlight trouble Empty Re: Headlight trouble on Sat Jan 02, 2016 2:26 am

DaleRT

DaleRT
Silver member
Silver member
Thanks for the quick reply's. 
      A bit more investigation - bear with me - 
   Right hand switch block - The light switch in the headlight position.
   Left hand switch block - When the headlight switch is in the Lo-beam position its brightness is greater than when in the Hi-beam position. When the flash/pass is operated it's brightness is as when on Hi-beam.
   Right hand switch block - The light switch in the Park position. When the flash/pass is operated it's brightness is also as when on Hi-beam. 

   Could it have the wrong headlight globe?  
   The wiring harness looks original. 
   I've had the L/H switch block of and all looks original, About to try to remove R/H switch block.
      Cheers   Dale

    

5Back to top Go down   Headlight trouble Empty Re: Headlight trouble on Sat Jan 02, 2016 2:33 am

Holister

Holister
Life time member
Life time member
Hi beam comes on so the bulb has to be OK and the earth has to be connecting so I'd say its gotta be in the left switch block.
Gaz80 wrote a post on the repair of the contacts in that switch just recently. Might be helpful.


__________________________________________________

1989 K100RT     VIN No.  0097367 (naked)  
1996 K1100RS   VIN No.  0451808
  Headlight trouble Austra12    Fuel:  95 Octane
Engine Oil: Nulon Full Synthetic 15W50
Gear Box Oil:  Nulon Synthetic 75W90
    

6Back to top Go down   Headlight trouble Empty Re: Headlight trouble on Sat Jan 02, 2016 3:02 am

DaleRT

DaleRT
Silver member
Silver member
Opened up the wiring harness behind the headlight plug and another plug has been fitted. So, three wires - Brown, Yellow & White - Assuming P/O had wired it up wrong, which wire should activated Hi- beam & Lo-beam?
   Appreciate your time.   Cheers   Dale

    

7Back to top Go down   Headlight trouble Empty Re: Headlight trouble on Sat Jan 02, 2016 3:30 am

charlie99

charlie99
VIP
VIP
just remember that its European .....so brown is always the earthy side of the connections
white = high and yellow = low beams power


good luck ...you may have found the issue


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

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%OHeadlight trouble 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 ..
    

8Back to top Go down   Headlight trouble Empty Re: Headlight trouble on Sat Jan 02, 2016 4:27 am

DaleRT

DaleRT
Silver member
Silver member
Thanks. 
   Reading through the Forum there is reference to having Relay's in the headlight system, one for L/beam & one for H/beam?  
   So, while i'm in there, What sort of relay's am i looking for & where would you suggest the relay's go?
      Cheers   Dale

    

9Back to top Go down   Headlight trouble Empty Re: Headlight trouble on Sat Jan 02, 2016 4:43 am

charlie99

charlie99
VIP
VIP
look for "eastern beaver " relays

he's an Japanese supplier of relay kits to suit ...made exceptionally well with good components

you can gleam from the the kits how the system works ....  

but in essence ...a relay is fitted so the headlight switch wiring switches the relay ...rather than the load to the headlight

there is an additional positive supplied from the starter motor relay (battery side ) that supplies the relays then the headlight as the relays are switched on and off

there are quite a few posts with diagrams throughout the forum

have you found the search function yet ?

addition recommendation is to fit an ceramic headlight connector

I use 3 relays ...as I have additional running lamps ...like many others

Headlight trouble Img_1410


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

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%OHeadlight trouble 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 ..
    

10Back to top Go down   Headlight trouble Empty Re: Headlight trouble on Sat Jan 02, 2016 6:41 am

DaleRT

DaleRT
Silver member
Silver member
While i had the Left hand switch block of i noticed one of the contacts looked low. It was loose in it's position. Others have commented on this being a problem. 
   Gaz80, has a good repair & pictures. I followed that but using a brass bolt i had.
Cut the outer flange of existing pin & punched it out. the brass bolt screwed in, but [as Gaz80 did] i also used epoxy as well. The silvery bit is what came out.
Headlight trouble 11-cd410 Headlight trouble 11-27210
   Dale

    

11Back to top Go down   Headlight trouble Empty Re: Headlight trouble on Sat Jan 02, 2016 9:20 am

charlie99

charlie99
VIP
VIP
yes that's the issue with our switches ....heat from arcing on a relatively small contact area

did you tap the plastic before inserting the screw ?
nice solve
love to see it finished


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

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%OHeadlight trouble 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 ..
    

12Back to top Go down   Headlight trouble Empty Re: Headlight trouble on Sun Jan 03, 2016 4:55 am

DaleRT

DaleRT
Silver member
Silver member
Hi, charlie99,  In solving it, it was a 'leg up' by Gaz80.

   No i did not tap the hole. It was a firm fit, it did not slip in but needed only needle nose pliers to wind it in. Used the Epoxy glue as a precaution against it working loose.   
   The brass bolt was 3.mm dia.
Headlight trouble 12-ccf13

   The drill bit was 1.5mm. [smaller would have been better]
Headlight trouble 11-73110

   The end to attach power was done by filing a flat spot, punching a mark then drilling. When i tried to drill all the way through the bolt broke. So, at the forth attempt, i drilled but not all the way through and turning the bolt over, filed away the brass to expose the hole.
Headlight trouble 11-27211

Headlight trouble 11-bf510 Headlight trouble 11-eb510 Headlight trouble 11-19310

   With reference to have i 'found the search function yet'  i'm only aware of the 'Portal page, Forum google search'.
   
   Dale

    

13Back to top Go down   Headlight trouble Empty Re: Headlight trouble on Sun Jan 03, 2016 8:28 am

charlie99

charlie99
VIP
VIP
yep that's the "search"

good work on the replacement

cheers for the pics as well


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

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%OHeadlight trouble 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 ..
    

14Back to top Go down   Headlight trouble Empty Re: Headlight trouble on Sun Jan 03, 2016 9:16 am

Dai

Dai
Life time member
Life time member
Word of advice for anyone replacing these pins and soldering on new wires: the plastic will heat up and deform very quickly.

Don't use anything less than a 25 watt or greater than 40 watt soldering iron
Make sure that the pin you are soldering to is absolutely clean
Tin it with solder as quickly as possible and allow to go cold (yes! let the heat out of the plastic)
Tin the end of the wire
When forming the joint, apply just enough heat to melt the solder properly and then get the soldering iron out of there. Don't apply any pressure to the pin with the soldering iron.

The original pins are actually slightly barbed. Having looked at the angles on some of the wires in a number of K-series switches, I suspect that the wires are soldered to the pin and then the pin (complete with wire) is punched into the plastic.


__________________________________________________
'83 K100 upgraded to K100RS spec, '87 K100RT
Others...
'78 Moto Guzzi 850-T3, '79 Moto Guzzi 850-T3 California,'93 Moto Guzzi 1100ie California
    

15Back to top Go down   Headlight trouble Empty Re: Headlight trouble on Sun Jan 03, 2016 3:07 pm

charlie99

charlie99
VIP
VIP
with that type of replacement I guess the best thing to do is tin the new lug ...before it goes back into the plastic dai


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

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%OHeadlight trouble 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 ..
    

16Back to top Go down   Headlight trouble Empty Re: Headlight trouble on Sun Jan 03, 2016 3:13 pm

Dai

Dai
Life time member
Life time member
Good idea. Very Happy


__________________________________________________
'83 K100 upgraded to K100RS spec, '87 K100RT
Others...
'78 Moto Guzzi 850-T3, '79 Moto Guzzi 850-T3 California,'93 Moto Guzzi 1100ie California
    

17Back to top Go down   Headlight trouble Empty Re: Headlight trouble on Sun Jan 03, 2016 7:37 pm

blaKey

avatar
Life time member
Life time member
Good tips Dai and Charlie!


__________________________________________________
Neil
K100RS 1986 RED!

Dress for the ride and the potential slide.
    

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