The Airheads Beemer Club is a non-profit club reclaiming the 'Legendary Motorcycles of Germany'

Topic-icon signal lights cause voltmeter to swing

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1 week 5 days ago #3960 by JohnB
My 1982 r100rt has a brand new battery and everything is working fine. When signal lights are operated the voltmeter needle swings wildly between 11 and 13 volts. An article in Snowbums mentioned this but did not offer any fix. Any ideas?

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1 week 4 days ago #3961 by Wobbly
Replied by Wobbly on topic signal lights cause voltmeter to swing
Sorry, not enough information.

When ? At idle or going down the road ? Headlamp ON or OFF ? What wattage HL bulb ?

Don't hide 'em, Ride 'em !!
#15150

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1 week 4 days ago #3962 by thundermotive
Replied by thundermotive on topic signal lights cause voltmeter to swing
My '83 RS does this, I consider it to be normal. It used to do it with the brake light as well before I replaced the incandescent with an LED. I miss being able to tell if my brake light is coming on this way. Now I have to look in the mirror and see if it reflects off of something.

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1 week 3 days ago #3966 by JohnB
Replied by JohnB on topic signal lights cause voltmeter to swing
Hi Wobbly
the fluctuating voltmeter happens all the time with the headlight on or off or when idling or driving down the road. I have not opened the headlight shell to determine what bulb may be in there.

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1 week 3 days ago #3967 by 15087
Replied by 15087 on topic signal lights cause voltmeter to swing
thundermotive I concur, no worries,
every one of the airheads I've owned...from r60 to r100 draw down like that when signaling..

favorite airhead I've owned, the one I'm now ridin

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1 week 3 days ago #3968 by JohnB
Replied by JohnB on topic signal lights cause voltmeter to swing
Thanks guys.
I kinda like it - i notice it more than the blinker light during the daytime!

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