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So apparently.... if the alternator positive cable is broken, you can get some funny voltage readings. I checked voltage at the battery (key off)- 12.4 volts. Checked voltage from the positive terminal to the ground terminal at the alternator- 0. Checked from the positive terminal to the...

Yeah, I looked surprised, too. Checked the meter 3 times to make sure I was seeing it correctly. It's a Fluke 115, so I consider it reliable. I was busy yesterday after work, but I'll try to check the wires tonight. Scott

Thanks, Ray. Good step by step instructions. I'll check that first. Scott

I was thinking after I posted, I wonder if a wire broke somewhere causing to GEN 1 light to come on originally, then I installed a defective voltage regulator. I'll check the associated wiring when I get a chance. I saved the original parts, so I can swap them back in and check the output...

The last time I drove the M1009, the GEN 1 light came on. I assumed the alternator was defective, so I ordered replacement internal parts. Today I rebuilt the alternator and reinstalled it. I started the truck, no warning lights. Then I noticed the voltmeter was reading in the yellow zone, and...