Electrical short after washing TM? Need advice!

[rjackson]

Hi Everyone,

I have an 2007 2720-SL that has not been experiencing any electrical issues - until I washed its exterior the other day! Getting the TM ready for a camping trip in about 2 weeks.

When I connect the TM to the electrical power source at my home, the home GFCI breaker immediately trips. (I "assume" that this circuit is on a 30-amp breaker, as I have used it dozens of time with no problems including with the air conditioner on.)

I figured some water had gotten someplace where it was causing a short and that it would dry out in a day or so and resolve itself. Two days of very hot weather, and no signs of water pooled up anywhere, and the problem remains.

To try to narrow the problem down, I have determined that it involves the circuit with the 30-amp breaker in the TM. When I turn off that breaker, it does not cause the home AC GFCI to blow. There are two other breakers, a 20-amp and a double breaker with 2 individual 20-amp breakers, which I can leave on with no problems.

UPDATE: I found a diagram for the TM's converter / breaker box. Looks like the 30-amp breaker is the main breaker in front of the other breakers. There are 3 other breakers; 20-amp for the air conditioner, 20-amp for the refrigerator and water heater, and 20-amp for the GFI outlets. The problem circuit is actually the upper 20-amp circuit, which I believe is the air conditioner. I had already been up on top and removed its shroud and gained access to the side where (I think) the power comes in. I removed the red and white wires, but this had no effect on the problem. If in fact it is the air conditioning circuit, the problem seems to be between the unit itself and where the power comes in. Not sure where to go from here...

UPDATE 7/28: The problem is fixed! See Post #8 below.

I was just about to climb up onto the roof to remove the air conditioner's shroud to see if I could spot anything, but I thought I'd ask for some advice on how I can begin to troubleshoot this problem.

Any advice much appreciated!

Thanks in advance,
Rick