All those codes sounds like there isnt enough CCA in the batteries or you have a bad connection.

How do the battery cables look?

 

When I disconnected each battery, the cables ends looked fine, no corrosion at all. I cleaned them off anyway with a brass brush then electrical contact cleaner. Load tester for both batteries had them both still in the green, albeit not well into the green.

Let me ask you this - if I swing my Cummins around and hook up jumper cables to the rig, would that be sufficient to check? As usual, whoever installed the batteries in this thing (we bought it used last year) didn't bother to put a date on the batteries, so I have no idea how old they are.

New batteries are on the short list, but the ones I want are not available locally, so it will be several days before I can lay hands on replacements.

 

Another notch in the "I shoulda bought a Cummins" column. [Edit to add: I should point out, if I could buy one of these rigs with my 20-year old Cummins engine in it...]

That was it - my '05 Ram has the Odyssey Extreme AGM65 batteries in it, so I figured it was worth a shot. Spun it around, hooked up my big-dog jumper cables, fired right up. Well, not "right" up, it took a second to think about life, then it started.

At least the Cummins will do a slow roll when it thinks it's not getting enough juice.

OK, thanks for the tip - I would've spent far too much time chasing my tail. New batteries on the way.

I do still have to figure out what that issue is with the driver's footwell wiring harness, if I can ever replicate it again...

Much appreciated.