50amp no 30amp yes

[BB_TX]

Where (in your circuit) is the surge surpressor located?
With your main breaker open, if you still have the high voltage you might need to look at your surge surpressor. It may be that it is the surge surpressor that has failed in some way to cause that increased voltage.

[grayghost03]

The surge protector is at the post and checks out good(tried it on another coach, all good) we are going to try your trouble shooting tomorrow (at a family reunion) have to do the politically think.

[ray fischer]

The exact problem happened to me. The C/G electrician checked everything. Finally found a loose screw in female end of 50 amp cord as Jim Fischer already suggested. The cord showed continuity, but only 1 leg hot in F/W. The cord was the last straw and it was the problem.

[grayghost03]

Cord checks good Con and voltage all the way to breaker, but to be sure we used another cord, same problem. Tomorrow with try Bill's test. Really appreciate all the replies, and thank goodness for 30amp, 93* yesterday and one AC was sufficient, today was 75* so no issue.

[grayghost03]

Bill, we did the all coach breakers off,we had 123V to bottom of both mains, flipped mains on, 123 bottom main breakers, started flipping on small breakers, fan breaker drove voltage up to 175V and tripped surge guard at pole, however #1A/C breaker will also drive voltage up. These (A/C and ceiling fan are located right next to each other, I think some how they may have a common neutral, have not verified yet, but does this guess make sense?

[BB_TX]

I think you may be on to it. Thinking out loud, if two devices had a common neutral, but those two devices were fed from separate hots, and the neutral connection was bad, you could get a higher voltage across that circuit. Not clear on how it would raise the voltage on one complete leg though.

Have you gone into your load center and tightened each and every hot screw on every breaker and every neutral screw and ground screw on the bus bars? And also all the 12v connections? I went thru mine and found a number of loose screws, a couple with wires just barely hanging in. Be sure to disconnect all power before you do that if you have not already.

[grayghost03]

I have checked connections on the 120 side but not the 12v side, will do. I still would really like to see a asbuilt schematic to understand why this problem on 50amp and not 30 amp. I think it will be back at my dealer on the 17th, and let them sort it out, but I know the techs really well and they will fill me in. If I don't sort it out first, I will keep ya informed.

[mhs4771]

When running on 30 amps thru the 30 to 50 dog bone, you only have one hot lead and it feeds both hot sides in the Monty, when on the 50 amp you're got two hot leads 180 out of phase with each other. So I think if you've got two appliances one on each leg but are missing a neutral it might be trying to return thru the other appliance. This is just a thought, but missing grounds and returns can cause funny things.

[grayghost03]

Michelle, I think you are on the right thinking line and I agree with you thinking. It is under warranty and I will let them sort it out if I don't find it before heading back. But I am looking and checking every time I am at the CG.

[grayghost03]

Can't duplicate problem at dealer.

[Fireater99]

Go figure right, we are having several electrical issues with our brand new 345DBQ. So we dropped it off for repair and the dealer can't get it duplicate the same issues. But I know as soon as we pick it up and drive the 100 miles back home and plug it in the issues will appear. Just our luck I guess. Good luck with your problems.

[grayghost03]

Received a phone call this morning from the CG, they discovered a problem the several of their post. Problem was in the campground, we tried the post on both side of us with the same results. It was in their step down transform, caused by someone pulling away without disconnecting. They thought damage was confined to post and had been fixed. NOT! But I really appreciate them tracking me down to let me know. These are really good people. I really appreciate all the help from all of you on the MOC site, I now know a lot more about my HC and will use this as a learning experience. Also for those that do not have some type of surge protection, mine just saved a lot of damage to my HC, on just its second trip.

[Art-n-Marge]

It figures that you couldn't replicate this at the dealer, but guess what? It was not the same conditions and the fact that this problem did not occur at the dealer was the clue and matches much of the problems you were seeing since it turned out to be the CG.

That was very nice of the CG to check their stuff and report back what they found.