At a minimum I would ground to the frane, not the tub.
The factory grounds the electrical system to the body and engine block. I don’t know if they specifically ground the frame to the body.
The two problems with grounding to the frame are-
-The ground wire will need to be longer than necessary
-There’s no guarantee the factory grounded the frame to the body. There will likely be continuity between frame and body, but might have more resistance than desired.
Just like the title says. I installed an arb twin compressor. Hooked it all up. Turned it on and the wires started smoking. It looks like the smaller ground wire melted everything from the contention to the inline fuse. My question is once I get a new harness. How can I wire it differently to not burn out the wires? When I hooked everything up. I hooked the ground wires to the body and not the battery. Could this be the problem? Any help from you all is much appreciated!
Connecting the ground to the body instead of the battery (or vice versa) won’t cause the wires to melt. What causes wires to melt is running too much amperage through them.
It sounds like a positive wire was connected to a ground, or a ground wire was connected to a positive terminal, or there was a short in the circuit.
NOTE: Make sure all your ground connections are clean. Many electrical problems can be eliminated by simply taking the time to ensure grounding points are clean.