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No, wasn't the main culprit. If I turn off the disconnect routinely, the rear battery slowly works it way up in voltage. When it gets to 15.6 (with truck running) volt regulator shuts off alternator. I've found if I'll leave disconnect on at night on occasion so there's a little drain, battery...

Finally got chance to work through it and found the battery terminal on the + side of the front battery would not tighten as far as it should causing a poor connection. It was tight on the battery, but lead wire was not making good connection all the time. Replaced it and now seems to be back...

Yes, I have a 'Those Military Guys' battery disconnect wired to disconnect the ground. Later added the 12v tap, but a relay there might be a good idea so it does not act as a ground for the front battery. Main problem is alternator working then randomly not working. Raining cats and dogs here...

Working on a 1986 M998 with 6.5 GEP and 200amp dual voltage alternator. Been working great, but on thirty mile trip to town this week, voltage dropped into yellow near the end of the trip. I have the 14v tap routed to the + post of rear battery and 12v accessories such as radio and emergency...