BMW K bikes (Bricks)

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1Back to top Go down   Fried electrics Empty Fried electrics on Thu Aug 13, 2015 5:55 pm

KyleMB

KyleMB
active member
active member
I have a 1988 k100lt with 140k miles. Purchased from a bmw mechanic in brooklyn. Mechanically the bike is great and had never had any electrical problems to the previous owner. 

I have been riding the bike for a little over a month.  A few gremlins I've encountered :
Sometimes the cooling fan cycles on/off with the blinker. 
Sometimes when i turn the ignition and pull the brake the lights go dim on the instrument cluster and the bike will not start until ignition is switched over again. 
Taking the bike on a road trip from ny to al i noticed that sometimes a loss of power would occur around 4k rpms or 3/4 throttle. Pulling the clutch the engine would rev past 4k fine but in any gear the power was lost. Restating the bike would fix this for a couple hours. 
Made it 1000 miles to alabama. 
I was heading back to ny through Atlanta and all the sudden i noticed that the tachometer/speedometer wasnt working, and the battery light was on. I pulled the clutch to restart the bike and nothing, no dummy lights... Blinkers, horn, headlight and brakes all work. So i pushed the bike off to get it off the interstate. Pulled to the nearest gas station and as i was using my blinker to turn, trying to cancel the light, smoke came pouring out of the right hand controls and from under the gas tank. Shut it off... walked it to a stop and checked the wiring. Lots of stuff fried on the right hand control connection, all the way up to the wiring for the fuel and fan cluster. 
Cant believe it. 
Not really sure where to go from here.

    

2Back to top Go down   Fried electrics Empty Re: Fried electrics on Thu Aug 13, 2015 6:04 pm

Dai

Dai
Life time member
Life time member
I'd guess there was a short between the kill switch input and the handlebars. Don't give up just yet - complete wiring looms in good condition do come up on ebay. There's also the possibility that someone here will have one.


__________________________________________________
'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
    

3Back to top Go down   Fried electrics Empty Re: Fried electrics on Thu Aug 13, 2015 10:33 pm

Gaz

Gaz
Life time member
Life time member
Might be worth checking the headlight switch on the right hand cluster if it is a model that has headlight switch as the headlights supply is not fused (believe it or not) from what I can see on the circuit diagrams while recently working on my K75.  A burned harness sounds like a fault on an un-fused circuit to me.

Cheers


__________________________________________________
Gaz
1990 K75 6427509; 1987 R80G/S PD 6292136; 2010 G650GS ZW13381; 95 K1100LT 0232224
    

4Back to top Go down   Fried electrics Empty Re: Fried electrics on Fri Aug 14, 2015 5:57 am

Dai

Dai
Life time member
Life time member
A thought - post some pictures as that will give an idea as to whether it's repairable.


__________________________________________________
'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
    

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