Ford Lightning with an onboard power system that provides a 240V output, tw0 110vac 180 degree?

[Effonefiddy Lightning]

Is the bare copper wire from the panel touching anything? Post a picture (it's worth a thousand worrds )

It was still attached.

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[Danface]

It was still attached.

So here's how it works. The truck has a Ground Fault Circuit Interuppter (GFCI) built into it and what that does is it will trip the breaker off if it detects any current flowing to ground through the ground wire (bare copper or green wire) because current should "return" via the neutral wire (so current going into the ground wire idicates a "ground fault"). The "gotcha" is that the neutral and ground both to to ground and are connected inside your panel which means the GFCI in the truck would detect the current going to ground (because those wire are connected in the panel) and trip off.

The plot thickens because all the metal parts in a ciruit need to be connected to ground so if the green wire from the truck is touching anything grounded (like the metal box for the plug) or is connected to the bare wire from the panel, it will trip off the breaker. SO that means you can either leave the bare wire from the panel connected to the box and make sure the green wire on the plug doesn't touch any metal (so remove any connection to the metal box and tape with electrical tape) OR leave the plug connected and make sure the bare wire from the panel isn't touching anything metal (tape it up and make sure it's not contacting the box) to keep the GFCI on the truck for tripping.

"Runway Tractor" was correct in saying it's better to leave the bare wire from the panel connect to both the box AND also use a jumper to connect it to the cover then just make sure the green wire from the plug is taped up and not touching anything metal BUT you would need a GFCI breaker in the panel ...