I can’t believe a shop would do this. Here is a good example of what not to do if you have an open neutral. We have a guide to show you how we fixed it.

Open neutrals in RV AC circuits can be extremely difficult to diagnose and dangerous if repaired incorrectly. In this case, we’re working on a Montana Fifth Wheel with a newly installed Dometic AC unit.

When you can’t locate the failed junction or open neutral, the only guaranteed repair is often running an entirely new Romex circuit. Before taking that expensive route, we always search for the failed connection first to save the customer time and money.

What we discovered in this coach was alarming: a previous shop had run a single wire to a separate neutral connecting it to a completely different wire gauge circuit. That kind of repair is unsafe, creates a serious fire hazard, and could have caused major damage to the coach or worse. The cherry on top is that they just drilled a hole through the roof (just sealed around the edges of wire) to tie into that different circuit and in doing so caused a short in the front bathroom DC lighting and vent fan circuit. What a mess.

Thankfully, we caught it on camera.

In this guide, I walk through:

• What an open neutral looks like in an RV AC circuit

• How to properly diagnose the issue

• The solution we used that avoided running a whole new wire

Knowing what to look for is half the battle. This is a must-watch for RV owners, technicians, and anyone troubleshooting electrical issues in a coach.