BMW K bikes (Bricks)

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1Back to top Go down   Instrument cluster bulb fittings Empty Instrument cluster bulb fittings Sat Aug 07, 2021 8:23 am

tinyspuds

tinyspuds
Life time member
Life time member
Dai wrote in response to a charging light issue I have:


……….
2. One or both copper tabs on the flexi-pcb has folder backwards rather than be poking down into the bulbholder's socket. It's dead easy to miss this when putting the bulbholder back in. What happens is

- you pull the bulbholder out and as you do so, the flexi-pcb flexes far enough so that the copper tab(s) clear the socket
- the copper tab(s) move into a position that is just slightly more than 90 degrees to the socket
- the flexi-pcb snaps back down but the copper tabs don't go back into the socket - that over-angle causes them to fold under the main flexi-pcb
- there's still enough copper exposed to make a connection with the bulbholder's contacts (most of the time)
- eventually they either stop making contact or they fracture away from the main flexi-pcb.

Seen a few like that. Actually, seen a lot like that.

—————————————————————————————————-

As I have the cluster open I thought photos for those unfamiliar (like I was 10 minutes ago) might be helpful.

Instrument cluster bulb fittings 296a4210

Circled yellow is one of the backlight bulb fittings.

Circled red is an empty socket with the copper tabs lifted away from the socket sides when the bulb fitting was removed.


Instrument cluster bulb fittings A076cc10

This is a backlight bulb and socket. The bulb is pushfit in either orientation (unless you have LEDs in which case orientation matters.

Instrument cluster bulb fittings D366da10

Underside of the flexi strip with the copper tabs for a backlight. Easy to see how these might fold under the strip rather than descend into the socket.


__________________________________________________
1985 BMW K100RT + Hedingham HUB and LL’s. VIN 0028106. (Not blind to the irony of an April 1 production date).
1986 K100RS in boxes. VIN 0141918.
1954 Royal Enfield 350 Bullet. Original.
    

2Back to top Go down   Instrument cluster bulb fittings Empty Re: Instrument cluster bulb fittings Sat Aug 07, 2021 10:22 am

mike d

avatar
Life time member
Life time member
You can get the same problem on the airheads.

Mike

    

3Back to top Go down   Instrument cluster bulb fittings Empty Re: Instrument cluster bulb fittings Fri Aug 13, 2021 2:57 pm

tinyspuds

tinyspuds
Life time member
Life time member
Having resolved my alternator issues I took the opportunity of an open instrument cluster to upgrade my backlights to LEDs. 3 of the 4 sockets did exactly as Dai described. Be vigilant.


__________________________________________________
1985 BMW K100RT + Hedingham HUB and LL’s. VIN 0028106. (Not blind to the irony of an April 1 production date).
1986 K100RS in boxes. VIN 0141918.
1954 Royal Enfield 350 Bullet. Original.
    

4Back to top Go down   Instrument cluster bulb fittings Empty Re: Instrument cluster bulb fittings Fri Aug 13, 2021 3:36 pm

Point-Seven-five

Point-Seven-five
Life time member
Life time member
It really sucks that after you put the instrument cluster back together, install it on the bike and connect the big connector, you turn the key and one of the backlights doesn't light up. Arrrgh!!!


__________________________________________________
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
    

5Back to top Go down   Instrument cluster bulb fittings Empty Re: Instrument cluster bulb fittings Fri Aug 13, 2021 8:20 pm

Dai

Dai
Life time member
Life time member
@tinyspuds wrote:Having resolved my alternator issues I took the opportunity of an open instrument cluster to upgrade my backlights to LEDs. 3 of the 4 sockets did exactly as Dai described. Be vigilant.
See? I told you my middle name is SmartAss. Instrument cluster bulb fittings 44271 Instrument cluster bulb fittings 44271


__________________________________________________
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
    

6Back to top Go down   Instrument cluster bulb fittings Empty Re: Instrument cluster bulb fittings Sat Aug 14, 2021 3:58 am

Arlina

Arlina
Moderator
Moderator
@Point-Seven-five wrote:It really sucks that after you put the instrument cluster back together, install it on the bike and connect the big connector, you turn the key and one of the backlights doesn't light up.  Arrrgh!!!

Got a point there Very Happy 

Don't put the cluster back together, first try on the bike.


__________________________________________________
Instrument cluster bulb fittings Eu-log10  K1100RS/LT - R1200RT - R1100RS (RIP) - Cagiva SST 350 Ala Verde - K75LT project - K75 Schurgers - K75S
    

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