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How much voltage to the headlight?

  • Thread starter Thread starter G.S.Joe
  • Start date Start date
G

G.S.Joe

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So I'm finally getting around to the electrical demons. Since I had the headlight apart to wire in the front blinkers I decided to see why my headlight does not illuminate. I've got continuity between all 3 connections on the bulb, and at idle I've got ~2.5 volts going to the connector for the bulb. Revving the motor does not cause the light to work. For all it's worth the dash lights work when I flip the switch. Bad bulb or not enough juice?


Info: Bad battery and no blinking on blinkers (though they light). I've yet to do the diagnostics to test the R/R.

I don't have a known good battery and I need a battery, tires, probably a R/R, and a few other things, so right now unfortunately the budget is not there (yet). Just tinkering away so when the $ is there I know what to buy.
 
Welll its a 12 volt bulb..so 2.5 volts isn't gonna work it. Take the bulb and 2 wires to the car battery the bulb there. Bt its bright as can be.
 
chuck hahn said:
Welll its a 12 volt bulb..so 2.5 volts isn't gonna work it. Take the bulb and 2 wires to the car battery the bulb there. Bt its bright as can be.
Click to expand...


Ah, didn't see a mark on the bulb and was afraid of a difference in current from a car battery to a running bike doing damage. Well, at least the bulb is good... Thanks.
 
If you got good light at the car battery, then you've got a wiring issue somewhere in the leads to the bucket.
 
It is rather senseless to try to diagnose ANY system without a good source.

How can you test your wiring, etc., without a good battery?
icon_shrug.gif


.
 
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