dim headlight

[Master077]

Hello
I have a 1982 gs 750t with 5500 miles on it. I am having a problem with the headlights and cluster lights. When I first start my bike the headlight and cluster lights are very brights, but after I put my bike in gear and drive the lights become very dim, to the point where I can't see my head light on the road. When I get home and I Park my bike the light is bright again . I am confused to what the problem is, this happens every day I ride my bike!!!

[tom203]

This sounds familiar- you likely have charging issues as I think I said before! Do some testing here's a quickee

http://members.dslextreme.com/users/storagecliff/images/electrical_odd-n-ends.html#A20

Connections on these bikes get worst with age, so don't just throw new parts at it and hope for best. Fix it and ride safe .

[BigD_83]

Master077...are you still around?

Did you resolve this issue?

[tom203]

Master077...are you still around?

Did you resolve this issue?

He's gone Bigfoot hunting!

[Master077]

Sorry for not replying sooner. I ended up replacing my stater, and I also created a ground going straight to the battery.
Thanks for the help everyone. Now onto other problem's lol

[Brendan W]

What are reasonable voltage drops in the headlight circuit? I've dropped 0.6V at the supply side of the top three fuses and a further 0.2V by the time it gets to the headlamp connector plug. No drop between plug earth pin and battery negative.

[posplayr]

What are reasonable voltage drops in the headlight circuit? I've dropped 0.6V at the supply side of the top three fuses and a further 0.2V by the time it gets to the headlamp connector plug. No drop between plug earth pin and battery negative.

V=I*R

Compute R as V/I (I for a standard head lamp is 5 amps).

A reasonable resistance is about 0.1 ohms and no more.
(.6+.2)/5= 0.8/5 = 160 milliOhms; a little high.

[BigD_83]

V=I*R

Compute R as V/I (I for a standard head lamp is 5 amps).

A reasonable resistance is about 0.1 ohms and no more.
(.6+.2)/5= 0.8/5 = 160 Ohms; a little high.

Am I missing something in the new-fangled math? Looks like the decimal place is right shifted. Did you mean 0.16 Ohms?

[posplayr]

Am I missing something in the new-fangled math? Looks like the decimal place is right shifted. Did you mean 0.16 Ohms?

No I was editing the mill-ohms and left off the "m".

Corrected now.

[Brendan W]

It's OK I got it. Targets are good. Thanks.