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Niehoff have some very good ducumentation on their website, including a comprehensive troubleshooting guide. When my regulator behaved erratic, this really helped me.

One addition to this: Niehoff did actually reply to my reqest, in a very detailed manner. Awesome company ! I wanted to share their hints here: First, the range given for field coil resistance (1.8 to 2.2 ohms) in the troubleshooting manual was meant for room temperature. The resistance rises...

Thanks for your replies, guys. That hint about the Trailworthy regulators is very interesting indeed. My voltmeters´ leads are the original ones from the manufacturer, and are pre-compensated for. I always put the points together before the actual measurement to see if the meter shows zero. I...

I just finished a body-off resto of my A0 Humvee and did a first test drive today. During the restoration, I swapped the 60 A for a brand new 200 A alternator. The 200 A is wired for dual voltage use, according to the TMs. I also compared and rechecked all the time with my A2 slantback, which...