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dim headlight

  • Thread starter Thread starter Master077
  • Start date Start date
M

Master077

Guest
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!!!
 
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
 
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.
 
Brendan W said:
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.
Click to expand...

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.
 
Last edited:
posplayr said:
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.
Click to expand...
Am I missing something in the new-fangled math? Looks like the decimal place is right shifted. Did you mean 0.16 Ohms?
 
BigD_83 said:
Am I missing something in the new-fangled math? Looks like the decimal place is right shifted. Did you mean 0.16 Ohms?
Click to expand...

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

Corrected now.
 
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