We have a 2000 DSDP. Turned it off one afternoon to go check in at the RV park, came back and it was dead - wouldn't start. Everything was working fine up until then. Like you, I assumed it was batteries. Tried charging and jumping, nothing. Crawled underneath and gave the stater a couple of taps. Still nothing. A mechanic suggested running a jumper wire directly from the battery to starter. This to verify that it was indeed a starter problem. With the ignition on we attached a jumper wire to positive side of battery and with the other end he touched the starter. It started right up.
Turns out there is a separate starter solenoid in the system that was bad.
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2000 Newmar Dutch Star 3859 - Caterpillar 3126B, 2018 Jeep Grand Cherokee Laredo, Demco Tow and Air Force One braking.
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