[Richard]

I am going to ask a few goofy questions based on my experience with Newells and Alternators. What brand and model of alternator is on the coach? And how many wires are connected to the back? You should have one big Positive wire, one big Negative wire, and then one or more smaller wires. I am really interested in the smaller wires, since that will determine the appropriate troubleshooting document to send you.

In both Newells I have owned, I have found that whoever wires them at Newell has a non standard way of wiring them.

In the first one, the voltage regulator was connected to wires, but the wires were dead ended just short of the alternator. I was not smart enough to figure out how the alternator was working but it was. I rewired that one to standard setup.

And my current coach has a “one wire” alternator, meaning it only needs an ignition activated 12V source to turn the alternator on, and it senses voltage from the charge wire. But, since the charge wire was connected to the center post of the battery isolator, and sensed zero voltage since the isolator is a great big diode, the alternator produced no output, But, Newell had made a jumper on the isolator from the center post to the chassis battery post. It made the alternator work, but it also had the result of tying the chassis and house batteries together enough to power the led lights in the coach. I also rewired this one to the standard method.

I tell you this yarn to forewarn you that you may find something non standard in the way the coach alternator was wired at the factory, and that non standard makes the troubleshooting hard to follow.

You could always throw a regulator at it, but that may or may not address the issue.

I