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Started up fine, decided not to hook up toad in exit lane of RV park. drove a mile away to empty restaurant parking lot to hook up. Turned off engine. after hooking up, turned key on and a few clicks and everything went out. Batteries fine, fuse on battery negative fine. No 12 volts on the main terminal in the back. Disconnect switch in the on position. Hard time getting 12v at starter connection so I took apart and cleaned cable ends. still no power. tested continuity across disconnect switch and results were not consistent. took terminals off and found black crust. Cleaned and put back and issue resolved-  corroded cables on cutoff switch which is a ground connection.

[RussWhite]

Nice work and thanks for posting!

[HoosierDaddy]

Good catch John. It’s difficult to track things down logically when we are on the road. This is a great reminder to start with the simple things.