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Old 10-23-2016, 03:29 PM   #1
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I need electrical help... Im an idiot.

I have a 2008 Crossroads Cruiser 5th wheel. we recently moved and at my new place I have RV parking next to my garage. I just noticed a receptacle that takes the exact plug for my 5th wheel. Assuming I was lucky. I just plugged it in.

I immediately hear a "pop" inside the trailer. My main board assembly exploded with smoke filling the cabin. Turns out the receptacle was wired to 220. Wonderful....

So I just ordered a new main board assembly (Im assuming it was 35 Amp because its the only one I could find that looked the same). I installed it and noticed my heater/fan no longer workers. I took the cover off the AC unit and see three capacitors. Could one of them blown out when I plugged into 220?

Or any other advice? Thank you in advance!
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Old 10-23-2016, 05:10 PM   #2
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Ouch. Sorry to hear that. You would hope that board frying would have stopped the current from reaching anything else, but maybe not.

Wish I could be more help but I'm sure Sansone on here can. Good luck!
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Old 10-23-2016, 06:06 PM   #3
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Anything that was turned on at the time that is 120 volts will be toast. I bought a new house with 30 and 50 amp hookups and plugged my tt into the 30a and lost the convertor and microwave. And I'm an electrician.
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Old 10-23-2016, 07:30 PM   #4
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My Daughter did the same but only lost her converter. Get an electrician to rewire the outlet. While you have him there get him to check out the a-c stuff in the camper
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Old 10-23-2016, 07:41 PM   #5
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Quote:
Originally Posted by lgdpt View Post
I have a 2008 Crossroads Cruiser 5th wheel. we recently moved and at my new place I have RV parking next to my garage. I just noticed a receptacle that takes the exact plug for my 5th wheel. Assuming I was lucky. I just plugged it in.

I immediately hear a "pop" inside the trailer. My main board assembly exploded with smoke filling the cabin. Turns out the receptacle was wired to 220. Wonderful....

So I just ordered a new main board assembly (Im assuming it was 35 Amp because its the only one I could find that looked the same). I installed it and noticed my heater/fan no longer workers. I took the cover off the AC unit and see three capacitors. Could one of them blown out when I plugged into 220?

Or any other advice? Thank you in advance!
Something is very wrong here, and with one of the answers. A 120 VAC outlet, including the TT30, has ONE hot, one neutral, and one ground. A 50 Amp outlet is indeed 240 volts, with TWO hots, one neutral, and one ground. The only time one would experience 220 Volts is if a circuit was wired across the two "hots." Just like your stove or dryer at home.
Because TT outlets are close, but wired differently from other outlets, two major types of mistakes occur. I think the OP experienced one, and the guy who had problems with a 30 amp outlet experienced the other. Even experience electricians, who don't realize that TT outlets are wired differently, can run into problems. Here are two great links: The 50-amp 120/240-volt 3 pole 4 and Mis-wiring a 120-volt RV outlet with 240-volts | No~Shock~Zone

good luck!
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Old 10-23-2016, 08:09 PM   #6
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Pretty sure the 50 amp plug my Miller cracker box plugged into was just like the 30 amp RV plug. It was 240 volts. Never tried it, but I bet it would fry some stuff on an RV.
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Old 10-23-2016, 08:18 PM   #7
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Pretty sure the 50 amp plug my Miller cracker box plugged into was just like the 30 amp RV plug. It was 240 volts. Never tried it, but I bet it would fry some stuff on an RV.
Yep, that's what one of those two stories said. Either an electrician wired it for 220 because is LOOKED like a 220 outlet, or it really was a 220 outlet, that, through wear on the ground lug, LOOKED like a 120 TT outlet. There are lots of reasons why shops, storage buildings, etc, would have such a 220 outlet, most generally for a welder or air compressor.
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Old 10-23-2016, 08:50 PM   #8
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Yep, that's what one of those two stories said. Either an electrician wired it for 220 because is LOOKED like a 220 outlet, or it really was a 220 outlet, that, through wear on the ground lug, LOOKED like a 120 TT outlet. There are lots of reasons why shops, storage buildings, etc, would have such a 220 outlet, most generally for a welder or air compressor.
yep, Previous owner was a Welder. He had Big compressors and welders back there... But also a trailer... So I Ass-umed... Im so mad at myself....

I will order 3 new capacitors... Anything else I should try?
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Old 10-23-2016, 10:50 PM   #9
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For the future, buy a RV surge protector. A 30 amp protector will cost about $100 for a low end, which is better than none. Always plug it in first. It would have prevented this issue.
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Old 10-24-2016, 06:00 AM   #10
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yep, Previous owner was a Welder. He had Big compressors and welders back there... But also a trailer... So I Ass-umed... Im so mad at myself....

I will order 3 new capacitors... Anything else I should try?
If the A/C was off, there should not have been power to the capacitors or fan. As stated, any 120v item that was powered up is suspect.
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