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Old 11-09-2005, 07:33 AM   #1
Stagehand OP
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weird taillight

Heres one:

1990 R100GSPD

I just noticed this last night. my tailight works fine up until about 2-3K RPM, then sputters and goes out. It acts like the charge light on the dash.
Brake lights work fine.
What is up with that?
any ideas?
My simple mind thinks like this: the light is losing it's ground when the revs go up, much like the charge light is supposed to. only the tail light needs another 1-2K of rpm to feel the loss of potential difference. Umm, is the tailight getting caught up in the charging circuit? inductively? ack.

Girlfriend says its been happening for a few days, she just forgot to tell me. I do a pre-flight check, but I hardly ever check when I'm half thru the rev range.

Thanks.
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Old 11-09-2005, 02:11 PM   #2
Stephen
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ditch the rubber grommets that hold the taillight on. they just let it bounce itself to death. make sure all the connections are good while you're in there.
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Old 11-09-2005, 02:49 PM   #3
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ok. good place to start.
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Old 11-09-2005, 02:51 PM   #4
ADKbeemer
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Quote:
Originally Posted by Stagehand
My simple mind thinks like this: the light is losing it's ground when the revs go up, much like the charge light is supposed to.
simple minds think alike!

Makes sense...probably a loose ground or the bulb may be loose or bad socket. You could rev it in place (neutral ) and try to see when it fails... your not seeing your headlight, gauges dim at all, right?

Clean the bulb base, socket, check connections...good luck!
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Old 11-09-2005, 03:59 PM   #5
Boon Booni
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I've seen bulbs that have a loose filament in them.. enough vibration allows it to come apart, but once stopped it rejoins itself.. Brakelight is a separat filament, if it was a bad ground I would think that it would also affect the brakelight as both filaments share the ground..

Of course I've had bulbs that worked really funny, marker light side wouldn't work at all, but when the brake was applied, only the marker side would come on. In this case, there was no ground, and the brakelight filament was grounding through the marker light filament, lighting only the markerlight filament.. Strange stuff indeed..
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Old 11-10-2005, 01:48 PM   #6
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Problem solved. Sometimes all you have to do is look at it. Brake light filament was fine, but the running light filament had broken and one side was bearing on the Brake filament. New Lamp, Fixed.


Thanks guys,

--Jumper of gun.
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Old 11-11-2005, 03:26 AM   #7
grimmboy
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How about some updated GS project images......
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