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Old 05-20-2013, 09:34 PM   #1
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50 Amp Coach Plug

Just got our RV back from being repaired. Funny thing: a post jumped out and hit the side of the RV while I was turning a fairly sharp corner.

One thing that had to be replaced was the 50 amp coach plug (i.e. the plug where the power cable plugs in to the coach). I have the other end of the power cord plugged in to a 15 amp plug in the garage. There is power to the 15 amp plug and power in the coach to the main breakers on the WFCO in the coach. I have a Fluke power sensing device so I know the power gets to the main breakers. There are smaller breakers on either side of the main house breakers. One side is hot and the other side is not. The microwave works, but the television, ceiling fan and fireplace do not.

Before the coach went in to be repaired, the television, ceiling fan and fireplace worked when plugged in to the house power. I can't honestly say that I ever tried the microwave before. I am going through a 15 amp to 30 amp adapter and then a 30 amp to 50 amp adapter.

My question is this: when they replaced the 50 amp coach plug, does it sound like they switched the hot wires? I really would like the television etc. to work. I don't need the microwave when we are at home because I can go inside to nuke something if I want it. Is the fix to swap the hot wires at the coach plug? If not, does anyone have any ideas (Herk, Turbs, anybody?)?

Thanks for your help.

Mike
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Old 05-20-2013, 09:38 PM   #2
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Mike,
I have to think they forgot to hook up one of your legs of incoming power.

I dnt think its possible for them to switch wires or it would trip your breaker where your plugged in to.

You might have to take receptical off the side of the camper.

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Old 05-20-2013, 09:40 PM   #3
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Sure sounds like something is wired wrong!
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Old 05-20-2013, 09:45 PM   #4
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Be very careful with this. If you (or they) do it wrong, you can put 240v across your 120v circuits which will be a disaster. Everything needs to be checked very carefully. Don't just assume it's because they left a wire disconnected. They might have swapped wires as well.
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Old 05-20-2013, 10:34 PM   #5
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Your coach electric system is two separate 120 volt systems, with a common neutral and common ground. It sounds like when the receptacle was replaced the two hot leads were swapped. If hooked up to 50 amp service everything will work fine, if hooked up to 30 amp your secondary circuit is now improperly hooked up.

If you are not comfortable working on electric systems or are not familiar with the 50 amp rv plug go back to your service center.
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Old 05-20-2013, 10:45 PM   #6
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Quote:
Originally Posted by joenic53 View Post
Your coach electric system is two separate 120 volt systems, with a common neutral and common ground. It sounds like when the receptacle was replaced the two hot leads were swapped. If hooked up to 50 amp service everything will work fine, if hooked up to 30 amp your secondary circuit is now improperly hooked up.
Sorry, but that's not right. A 30->50 adapter puts power on both of the hot legs so swapping them wouldn't cause this problem. Also, as I said before, "assuming" that everything will work fine when plugged into a 50-amp outlet may cause a disaster.

(Furthermore, it's not "two separate 120 volt systems". It has to be a center-tapped 240 service or the neutral will melt.)
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Old 05-21-2013, 07:56 AM   #7
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Quote:
Originally Posted by BarryD0706 View Post
Sorry, but that's not right. A 30->50 adapter puts power on both of the hot legs so swapping them wouldn't cause this problem. Also, as I said before, "assuming" that everything will work fine when plugged into a 50-amp outlet may cause a disaster.

(Furthermore, it's not "two separate 120 volt systems". It has to be a center-tapped 240 service or the neutral will melt.)
You are correct if the 30 to 50 amp adapter was purchased at a store and made for RV purposes. If it was a user made adapter, maybe only one hot leg was wired in the 50 female plug. Most likely as you said, the repaired done by the dealer is at fault and needs to be checked again for proper connections.

N9ID, I would not connect into a 50 amp pedestal/receptacle until this has been fixed otherwise 240 volts could be applied to your equipment.
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Old 05-21-2013, 08:18 AM   #8
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Take it back and have them fix it correctly.
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Old 05-21-2013, 09:00 AM   #9
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Take it back and have them fix it correctly.
Yep!
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Old 05-21-2013, 09:03 AM   #10
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Two more little points.

I guess this is somewhat of a rare case, but wanted to point out that a Hardwired Surge Protector would be useful in this case, whereas a portable one at the pedestal would not.

Also, FYI, there is nothing wrong with switching around the two hot leads (Red & Black) on a 50-amp service. They are symmetrical and no circuit tester will ever be able to the the difference. (However, if there are color labels on the connections, they should be followed to avoid confusion.)
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