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Thats strange. I would take them out. Trickle charge individually over nite. Something caused them to go dead.

I find if the interstates go dead they don’t come back. No one else around me carries the 6tls though.

Run a temporary ground wire from the negative on the batteries to the ground on the pdp. And you can run one right to the ground strap coming off the starter going to the frame rail.

Run the ground wire. Or the polarity box is bad.

Run a ground wire from the batt negative to the breaker panel ground see if that helps.

The wire harness has numbering on each wire leading to a plug. Write down each one before you disconnect. The manual should have a schematic showing where it all goes but it’s easier if you keep track of the connections yourself. I take pics with my cell camera as I am taking stuff apart too.

I usually pull the steering wheel if I need to get deep into dash work.

Under the box to the right of the batt box, where the disconnect relay is, should be a manual disconnect switch. Reach under the box it turns.

I would check the load battery box behind the cab.