Thread: Ironhead Generater light question
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Old 6th August 2021
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Quote:
Originally Posted by The Doctor71 View Post
There is no diode in that circuit on a '69, so let's squash that thought, up front. Unless of course you've got some bastardized wiring harness that we haven't been told about.


Why do you think your electrical system is charging ? and not dis-charging ?

If you're correct, I kinda doubt that will last for long. From my "arm chair quarterback" position, it smells like your battery is discharging. To what degree is the question.

I suppose a chaffed wire could be the cause, but I suspect there would be other tell-tale signs if that was the case. (aka smoke emitting from your wiring).


Yes, that is correct.

And yes, that is not a ground wire. It looks like it might be a ground wire, but it's not a ground wire. It does not go to ground. Think of it as a "complete the circuit", wire.


NO, both wires do not go to the GEN terminal on your voltage regulator (VR). And if you check again, you'll find they do not, BOTH, go there. If they did, the light would never illuminate.

One wire will go directly to the GEN terminal on the VR. The other wire will take a longer route but will get traced back to the BAT terminal on the VR.

Movin' on.............

As others have stated, the way this light operates, is pretty simple. It's "electrical" pressure applied to either side of the light. If "electrical" pressure on one side drops below the other side, the light illuminates. (assuming of course the light is not burnt out & the wires are properly connected/not broken, etc.). As long as the "electrical" pressure on both sides of the light is identical, the light does not illuminate..... which is the normal case when the motor is running and the electrical system is solid.

Based on your description, what you have (with the motor running & the light being illuminated) is different "electrical" pressures being applied to either side of the light.

So now what ?

Get out your multi meter/ohm meter & monitor the voltage (with motor running at fast idle) at the GEN and BAT terminals on your VR. What do they read ?

Do you have an "AMPmeter" to test the output of your generator ?

Failing that, it will be difficult to accurately diagnosis.... and you're into blindly swapping parts or blindly rebuilding the generator, in the hope you find something there.

You might get lucky & a cleanup of the generator and a fresh set of brushes may resolve your issue..... but it's a wild a$$ guessing game at this point.
Based upon your level of knowledge it can be a SCIENTIFIC wild assed guess...
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