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Bad headlight, jumping voltage, what the...??

  • Thread starter Thread starter nitroguy
  • Start date Start date
N

nitroguy

Guest
Ok guys, I'm frustrated. I finally sat down to fix my headlight, and I couldn't fix it. Here's the problem.

My headlight went out on my 1980 GS550. I bought a new one that I didn't realize was a 100/55W (instead of the 50/55W I took out). But I plugged in the new one, and it doesn't work. I plug in the old one, and it doesn't work.

So I took out my multimeter (cheap chinese knockoff one) and the voltage reading I got across black/yellow and black/white was either steady 11v or jumping all over the place.

That's all the info I can think of to tell you to help me. But I really want to ride (it's finally nice outside), so if you could help me, I'd love it.

I hope I can get to the bottom of this, I feel like I'm ready to throw in the towel and get a newer bike.

Thanks guys.

Phill
 
Looks like you need a little help with systematic and logical troubleshooting.

Does your fuse panel have five fuses in it? If so, the top fuse is for the lights. Measure your voltage there to see if it's doing the same stuff. If voltage is OK there, then the problem is downstream, so look at the plug that is under the fuel tank. Probably a 9-pin plug, usually toward the right side. Then follow the wiring up to the dimmer switch, then on out to the headlight socket. Clean all connectors as you go. Once you finally get steady reliable power at the headlight connector, don't forget to make sure you also have a good ground from the headlight socket to the chassis.

.
 
ground the black wire from the battery to the frame better.
 
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