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Topic-icon 1978 RS100 troubleshooting dead electrical

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3 months 6 days ago - 3 months 6 days ago #5084 by Wobbly
Replied by Wobbly on topic 1978 RS100 troubleshooting dead electrical
Start up Google, input "BMW R100" or "Airhead Repair", and then select "Images". Tons of Airhead photos will pop up of Airheads in all stages of dress and undress. Should be something there for you.

Hope this helps.

Don't hide 'em, Ride 'em !!
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Last edit: 3 months 6 days ago by Wobbly.

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3 months 6 days ago #5087 by Wursthead
Replied by Wursthead on topic 1978 RS100 troubleshooting dead electrical
thanks again my friend

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3 months 4 days ago #5096 by Wursthead
Replied by Wursthead on topic 1978 RS100 troubleshooting dead electrical
This is what I’m dealing with. Just trying to figure out what goes where. The schematic I have for this year bike doesn’t match up with numbers on the dual 87 relay.. maybe I’m missing something? Thoughts?
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3 months 4 days ago #5097 by Wursthead
Replied by Wursthead on topic 1978 RS100 troubleshooting dead electrical
If I connect direct from battery straight to the starter the bike kicks over

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3 months 4 days ago - 3 months 4 days ago #5098 by Wobbly
Replied by Wobbly on topic 1978 RS100 troubleshooting dead electrical

Wursthead wrote: If I connect direct from battery straight to the starter the bike kicks over.


No doubt. Since the starter is permanently wired directly to the battery this news comes as no huge surprise.

► First step was all about insuring power is flowing to the entire electrical system. That's what the starter relay issue is all about. That is to say, are you getting power into and then out of the ignition switch. (In computer troubleshooting lingo, this is the equivalent of asking: "Is the computer plugged in ?" :P )

► Then there is a second tier of investigation at the starter interlock, which keeps you from starting the bike in gear. The bike either has to be in neutral OR the clutch has to be disengaged at the lever. Either one of those sensors can be faulty.

Hope this helps.

Don't hide 'em, Ride 'em !!
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Last edit: 3 months 4 days ago by Wobbly.

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3 months 4 days ago #5099 by Wursthead
Replied by Wursthead on topic 1978 RS100 troubleshooting dead electrical
I’m here wrenching on it as we text. I got power to to the starter and bike but there’s no turning the power off even with the key in the off position ??
Thanks again for your time. Really appreciate this

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