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head light burns out Engine dos'nt run right

  • Thread starter Thread starter Bud
  • Start date Start date
B

Bud

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I have a 1982 gs300l when heah light burns out the engine will not rev. i can witch to the high beam or low beam ( the one thats not burned out) and it runs fine or i can turn on a turn signal and it will rev when it blinks or lightly apply a brake just enough to get the brake light to come on and it runs fine. Any thougths why this is happening?
 
How often is the headlight burning out? Generally frequent burnouts are a sign of overcharging because the regulator is shot. Maybe when the load is too low the voltage is too high. Check out what voltage you are getting at the battery when she's running.
 
On limited information; I would suspect the regulator is shot and producing too much voltage - the load of the headlight (or other lights) is clamping it down a bit and the ignitor is happier. If it is an electronic ignition on that bike, you don't want to be over-volting it, as it will burn out. This may be why the other filament on the headlight burned out in the first place.
Do you have a multi-meter to put across the battery and check what your charging voltage is?
 
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Brendan W said:
How often is the headlight burning out? Generally frequent burnouts are a sign of overcharging because the regulator is shot. Maybe when the load is too low the voltage is too high. Check out what voltage you are getting at the battery when she's running.
Click to expand...
Post the voltages from the "quick Test "
 
Racing certainty the regulator is shot. It should be capping it out at about 14.4V. Depending on how long it's been going on the battery may also be in trouble and it's also the reason your bulbs are blowing.
What other measurements did you take, battery at rest, ign on, idle etc?
 
You need a new r/r ; get the sh-775. Wonder why there is such a spat of end of season overcharging going on right now.
 
Bud said:
I'm getting 18.5 volts across battery.
Click to expand...

Oh, crap...I'm surprised you're not getting smoke coming out of the battery with that kind of voltage. Keep an eye on it, as you have, or are probably very close, to having it run dry, which will likely cause a dead short in the plates.

I agree with posplayr and Brendan. A new R/R should be your first order of priority.

Where abouts in this big bad world are you located?
 
at rest 12.8V before starting idle 14.5 to 15V after checking battery at rest is 13.5V and droping
 
Bud said:
at rest 12.8V before starting idle 14.5 to 15V after checking battery at rest is 13.5V and droping
Click to expand...

The 12.8 and 13.5V are slightly on the high side of normal. The idle voltage is high. With luck you just might have escaped battery damage. Make sure the electrolyte is topped up and keep an eye on it. If it's getting warm charging or you are losing electrolyte be aware that ( drama queen hat on) half filled batteries with shorting plates can go bang.
 
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