Search results

I suggest you check the voltage at each alternator. The regulator set point is 14.8 volts. If both alternators are operating you will see about 28 volts. To determine if the problem is in the alternator, click HERE.

I can't speak of the light bulbs because I have never had mine out. I don't think the type is critical. I would worry more about the plastic cracking than melting. The lights are never on that long.

Probably not, the regulator has to see enough voltage from the trio to turn on and start regulating. Initially, the voltage in the alternator is low and the light is on because it is grounded (not direct ground, there is a resistance) through the regulator. If the idle speed is a little low...

If you unplug the two terminal connector from the regulator, does the light go out?

That's common. My passenger side alternator is the same and probably has never been rebuilt since the truck only has 28K miles. The driver side I rebuilt a few years ago and the light goes out immediately.

What happens if you increase the RPM slightly by pressing the accelerator before the light is out? Does the light go out immediately?