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It does increase with run time - I’ll keep checking. Fingers crossed it’s not wiring.

I was looking at that exact one - kinda pricey for my “truck budget”, but I’ll probable get it. Have you had a chance to hook yours up? I would love a real world review before I spend the $’s.

I just tested with my Harbor Freight battery load tester. The #1 was rebuilt 3-4 months ago, #2 rebuilt 2-3 days ago. The number one seems to move the needle after the truck has been running for a while. Hopefully unrelated (but I didn’t think to notice the timing), I did get the high idle/ip...

It seems these can also be had- solar powered.

The questionable battery is on the charger (at home now) I will disconnect and check tomorrow. Hopefully it was the problem.

That would make sense as the battery need-to-jump-situation came on very unexpected. Plus it might also address vanaisa’s above concerns. I’ll plan on pulling the starter and dropping it by the same place I had the #1 alternator rebuilt.

Yep- no change as I removed the fuses. Might the starter have been (and will be again) the problem/draw. Armature ending up touching vs. not touching the fields, as it stops spinning?

I tested both alternators - good voltage at idle. After the 40 mile trip, I did start it (to be sure it would), but turned it off almost immediately. Might the, hot, starter (if not at 100%) have sucked the batteries down? Is there anyway for the starter to cause/contribute to the drawn down...

Alternator(s) are next on the to do list

I think it was set to 20m (I guessed milliamperes). I have a new aftermarket alternator. I’ll probably install it while I have the #2 alternator rebuilt and see if that fixes the draw. And yes - it was taking a day or two to deplete the battery, enough to need a jump start.

I’ve been keeping an eye on front battery (about 5 months old) - occasionally having to jump it from another vehicle. The #1 alternator has been rebuild - dash lights show both alternators to be working. The morning after my 40 mile trip the battery was dead, but jumped off easily/quickly. I...