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Old 08-07-2014, 07:06 AM   #1
j8tg OP
Joined: Jul 2014
Oddometer: 3
Not Charging--No Brake Light/Horn

My 1981 R100RT is not charging,(per voltmeter on fairing), and at the same time the brake light is inoperative and the horns are barely operative. Battery? I have had to adjust the Fiamm horn screws to get them past a low warble and they are likely not at full steam--could this be draining the system?

I have just purchased the bike and did search for any similar issues involving the light and horn but was not able to find anything.

Thanks for any help.

1981 R100RT
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Old 08-07-2014, 05:17 PM   #2
Joined: Aug 2012
Oddometer: 2,267
Question More info

Not enough information to guess what it could be at this stage.

Basic hints can be had from;
When you turn on the ignition key switch .. do the 2 warning lights come on? Bright? Does the starter motor turn over the engine slowly? Briskly?

Depending on the answers to those questions .. you may need to do some measurements with a voltmeter.

Don't adjust things until all faults are removed! You may have to go back and readjust things once they have the correct input to them.
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Old 08-07-2014, 06:35 PM   #3
j8tg OP
Joined: Jul 2014
Oddometer: 3
All other lights are good. Took it to Pete at Bavarian Motor Works West in Denver as I think the harness is "custom" and past my pay grade. This my 2nd airhead after a 30 year hiatus and am a little to anxious to ride and not much patience at the moment to figure things out.

Looking forward to contributing to the forum in the future--

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Old 08-08-2014, 03:24 AM   #4
Bill Harris
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Location: backwoods Alabama
Oddometer: 8,192
For future reference, the "brake-horn-turn signal" branch of the circuit typically contains the Alternator light, which is needed to energize the alternator at startup. If that fuse goes, so does the lamp and the alternator. The fuses are in the headlight bucket...

'73 R60/5 Toaster
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