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The early A1s use very similar dash panel wiring and connections to the first gen trucks. Same with the polarity box. With the C7 came data bus and advanced polarity box.

That makes life easier. Saved a copy for myself.

The A1 manual is only on computer. No pdf files. I wish there was a paper schematic I could lay out on the table and work thru.

Maybe a switch at the dash is not connected properly and power is feeding back thru it. The manual is electronic it has specific troubleshooting but I have not found wiring diagrams that can be printed out or laid out unfortunately.

Is there a breaker you can pull to de-energize 24 volts to that circuit?

He has stuff powering on with the switch off

How do you know you got all the dash connections correct? 24 volts should be switched by a 12 volt circuit activated by the dash power switch. Illumination should go thru the light switch if that's off and illumination is coming on maybe theres a short somewhere. What year and model is the...

Maybe you are somehow bypassing one of the two large relays under the panel. Those relays have wires to the panel. Maybe a pair of relay leads accidentally got switched when swapping the panel. Here is a pic of where they go.

Disconnect your batts something is def wrong. Start at the batts make sure installed properly. move on to the polarity box under the spare tire, after that the power cables go along the frame and around the pivot and into the cab. Check at the alternator make sure the outputs are not swapped by...