'78 R100RS Turn Signal Light Leak

tracy graham · 2022-04-11T21:33:16Z

Hey all. I have a 78 R100RS that I acquired (bought) from my step father back in 2018. Cosmetically, it needed help, but over all the engine was taken care of and was started every few months, and was stored correctly. I keep it at my in-laws house and work on it when I can so my updates and upgrades are usually spaced out about 3 months, but when something goes wrong, I sometimes have to wait until the next time I visit to try and fix it. This also gives me a fair amount of time to research on the subject. Luckily when we visit, we do for 2-3 weeks so we can get some serious miles on the bikes, as well as some serious wrenching. And with the current state of the world, especially 2020 and 2021 and having the luxury of working remotely, I have been able to make significant strides on the bike and get it to about 90% to where I want it to be. Bikes runs, nothing smokes, all electric works. Its almost damn near perfect. On that note, why am I here and what is my problem. This problem has been plaguing me for quite some time now. I have upgraded all lights to LED back in 2020. Katdash LED dashLED bulbs in voltmeter and clockLED front parking lightCyclops LED headlightLED rear tail/brake lightLeft and Right LED turn signal bulbs (with FL3 flasher relay) Ok, so now the problem. There is a light leak happening on the left side turn signals when the bike's kill switch is in the 'run' position. This includes when the bike is running and not running. All the electronic components I listed up above work fine, just when the turn signals are not activated, we have a light leak. - When the bike's kill switch is on the 'off' position, all of the electronic components I listed up above work fine, noting that the dash is not illuminated (assuming thats normal), the light leak on the left side turn signals is gone, but when the left side turn signals are activated (both front and back) I get a clicking sound (imagine snapple freshness/safety seal bottle top) from a little place just south of the starter relay (behind the left side panel: there is a small rubber round thing. No idea what that is (see the attached diagram for what 'i think' it might be. So does anyone know what this is or how this works? I'm not as electrically inclined to fully understand these things, so by all means, please speak layman to me. I am at my in-laws now and have 5 days here to figure out this problem, otherwise I won't be working on it until maybe July? Any and all help would be swell. Screen-Shot-2022-04-11-at-10.59.36-AM.png

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David Elkow

(@4949)

Posts: 391

Reputable Member

@wobbly I need a new schematic.

Posted : 04/13/2022 10:16

Richard W

(@wobbly)

Posts: 2748

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Posted by: @4949

@wobbly I need a new schematic.

If it's not in your manual or on the web, then I can't help.

Owning an old Airhead is easy.
Keeping an old Airhead running great is the true test.

Posted : 04/14/2022 05:29

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