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It was the alternator. Batteries were / are good. Voltage readings were while truck was running so expect them not to be 12.6 due to electronics. The troubleshooting chart that C.E. Niehoff provides has you figure out if it's the alternator or regulator without the need for a known good...

Ok guys, went to C.E. Niehoff's website and they have troubleshooting guides for the regulators, Ya!!! For this regulator / generator combo this is the guide. Edit: uploaded wrong guide. Corrected for N3030 regulator

Saw one out of alabama. Just hate to order a regulator to find out it was the alternator instead. If I had a schematic of the regulator I could rule it out ahead of time.

I'll lift the cab tomorrow morning and snap a pic of the alternator.

I picked up a M1079 for a member and got it topped off with fluids. I flat towed it to the house, that was an adventure in itself. Last night I was going over it preparing for the road trip to bring it to it's owner in Louisiana and noticed the battery gauge was in the low yellow. Got out the...