Generator light....

The generator light is telling you that you have a problem.
Could be a problem with the regulator or with the generator - it may just be a loose generator drive belt.

If it's intermittent it may be working well enough to keep the battery charged - but it will get worse unless you do something about it.

Does your ammeter show a discharge when the light comes on?

What happens if you turn on the headlamps?

Thanks....I thought that the light should stay off. I've been battling an electrical gremlin for the past few years that I thought had left me. Looks like it is back. I've been working with Pat Mical on it and he thinks it is a ground issue somewhere. I have destroyed multiple altenators and coils in the past so am getting used to the signs of a non-charging battery. It isn't behaving that way now. The ammeter needle is always on the positive side, even with many electrical motors being activated at once (windows, lights, fan, etc.). The needle goes negative when I run the AC at idling RPM's. It goes positive again when I increase the RPM's.

The altenator (heavy duty thing that cost $$$ and includes the regulator and a cooling fan) and the coil are new. So is the truck battery that I'm running in it.

I'm going to have to really spend some time going over all of the grounds I think.

I had the same problem. I had replaced my alternator and one of the studs was touching the cylinder head.
I trimmed it back as short as I could and everything is now ok.
The problem is really that you can't see there because of the location of the alternator.