Tripping gfi in garage when plugging into garage

The other funny thing is that it does not trip right away. Takes a couple of minutes, but I have nothing on, no frig. , hot water heater , micro wave so can't tell the draw. The end shows 126 h, 0 amp and ems shows ok.

The strange thing is that it was working for over a week. Had ac and microwave circuit breaker off to try and isolate. Even removed one of the leads to water water but still tripped. Water heater does not appear to be fried. It works on the generator with no problem. I was thinking the same thing that is why I tried it on the generator. Even tried a different outlet on the house which was not in the garage.

Trip all circuits in motorhome to off. Plug in motorhome to garage gfi. Turn on and then back off each motorhome circuit until gfi trips. You now know what circuit in the motorhome may have a ground fault or has a appliance on with a greater than 15 amp draw such as the AC, Water Heater, microwave, etc. If none of the circuits trip the GFI by themselves then turn on one and then the next until you overload the gfi. At least you may be able to isolate the cause somewhat this way.

got to make sure all three lines are being used all the way from the 120VAC receptacle to the trailer shore power cable. Might be no ground wired to your receptacle in the garage also....

Pick up one of those 120VAC circuit testers. This will tell you if the proper circuit connections are present...


In my case it is usually the other way around. MfyGFCI in the trailer trips haha...

Roy Ken

In our house the garage gfi is also part of the master bath gfi circuit. Wife drys here hair while I am using power tools in the garage and click goes the breaker. Would love to separate it out but just not worth the cost. Maybe one of these days. Could the water heater have fried and causing an excessive draw?

sometimes there is something else on the same line inside the house. We had a problem at a friends house whenever their freezer in their basement kicked on. turns out it was on the same line as the garage outlet we were using.