Powered by Blogger.
We are saddened to announce the passing of Gary Bunzer on April 17, 2020. We hope the RV Doctor website will continue to provide helpful information for you. Thank you for your interest and support for the RV Doctor - Debbie, Heather and Gretchen

Tuesday, October 20, 2009

Trippy GFCI

I have a troubling electrical issue. Last year when I plugged in my brand new RV at the campsite the GFCI on the pedestal tripped immediately. The campground had to wire up a standard non-GFCI outlet and then everything work fine. I took the RV into the dealer for service and everything checked out fine. They said that possibly the GFCI in the coach needed to be reset or I had moisture in the plug. Recently I took the RV out of storage and plugged it into my house which had a GFCI in the circuit and it tripped again as soon as I plugged it in. I’m taking it in again for service but I am expecting a similar response that everything works fine when they plug it into their GFCI outlet. Any ideas on what might be the problem? Jeff, (Monroe, OH)

Jeff, it's quite possible you have an electrical problem within the alternating current (AC) system on the RV. I would avoid using it until this situation has been resolved. Plus I doubt I’d take it back to that same dealer. At least not until their technicians get some further training. As to the actual problem; the GFCI is tripping because it is detecting an imbalance between the hot and neutral conductors in the unit which usually indicates a leakage to ground on one of the wires. You can easily do some preliminary investigation yourself. 

Purchase a plug-in circuit tester from your local hardware store. They are relatively inexpensive, reliable and invaluable when checking out AC electrical problems within RVs and even park pedestals. In fact, I recommend that every park pedestal be tested and the voltage measured before ever plugging in for the first time. 

For now, plug your coach into a non-GFCI circuit so it won’t trip during the test. Test every receptacle in the coach. Don’t forget those hidden receptacles like behind the refrigerator, microwave or converter. If the tester indicates a problem it will be identified. It is also possible that the GFCI receptacle in the RV is itself faulty and the park GFCI is sensing this fault and tripping first. 

Most well equipped RV service shops will have a GFCI test device on hand. A quality GFCI test device can apply a variable and controlled amount of leakage to the GFCI to determine if it trips at the correct level. 

You can also eliminate or condemn the GFCI by removing it temporarily to see if the source GFCI still trips. Obviously, the shoreline cord should be unplugged before you remove the GFCI. Simply connect all the black wires together and the white wires together after you remove the GFCI. Be sure to note which is the incoming conductors and which are the downstream conductors; it makes a difference. 

If the problem is eliminated by removing the GFCI then simply replace it with a like model. If the problem persists it will be necessary for a qualified service shop to run a full battery of tests including a hot skin test. There’s little else the handyman can do.


In all instances, every effort is made to ensure the correctness of all content on the RV Doctor Website. It is imperative that if you choose to follow any instructions or procedures outlined on any page of this website, you must first satisfy yourself thoroughly that neither personal nor product safety will be compromised or jeopardized.

All rights reserved.

If you are in doubt or do not feel comfortable about a procedure, do not continue. Simply call your local RV service facility and make an appointment with them. The advice, recommendations and procedures offered by the RV Doctor are solely those of Gary. They do not necessarily reflect the opinions, procedures and recommendations of our sponsors or advertisers.