Plugged in the trailer yesterday after it has been down for reinstallation of the interior after a floor replacement. The GFI breaker tripped soon as I flipped it to the on position. There are 5 outlets, using 2 12/2 wires, that run from that breaker. Nothing was plugged into any of these outlets during testing.
After doing much reading of threads on the subject I did the following to try to find out where the problem lies. Today is the 2nd day of trying and still the breaker trips.
Checked outside power inlet wiring, new Marinco inlet installed, it looks good.
Checked wiring of all outlets on the circuit that were disturbed during interior work. Hooked up correctly, no breaks, screws tight, can't see a problem. Removed different outlets from the line and breaker still popped.
Polarity checked and good on outlet from house that supplies power, 20 amp outlet. Polarity in outlets in trailer that are on other circuits check good. Voltage 122.
New Iota converter installed. Removed it from the equation, breaker still popped. Plugged it into a separate outlet with an extension cord containing an inline GFI. It seemed to work fine, didn't trip that one.
Cleaned 120 volt frame ground attachment areas and hardware. Has a new #6 ground coming from breaker panel. 12 volt
side has same new ground wire to frame. Combination 120/12volt panel, converter plugs into it also.
Have a molded 30 amp shore cord using a 30 to 15 adapter. Have 2 new adapters, used them both made no difference. Checked to see that none of the neutral wires in the bar are touching any of the ground wires in the bar and that all are tight. Hot wires to breakers tight.
Makes no difference if any of the other breakers are on or not, as soon as I turn on the main 30 amp breaker allowing power to come in the GFI breaker pops. I also replaced the GFI breaker with a regular 20 amp breaker and all was well. While I had it switched, checked polarity on outlets on GFI line and it checked good, voltage 122. Then I got another new GFI breaker and $44.00 later I'm still at square one. New breaker made no difference.
As long as the GFI breaker is left off you can turn on the other circuits and they operate fine, 120 and 12volt, so far as I can tell the new converter seems to be working.
I read some posts that talked about removing neutral wires to test the system. Don't know exactly how that was done, what to do when, with power without, etc.
Out of ideas and open for input, not sure where to go from here.
Don't think it matters but for the record there is no battery installed right now.