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Old 03-16-2014, 10:35 AM   #1
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CCC warning no shore ground/ polaritie

Hi all I need a little help, while rv goes through systems check with shore power pluged into one leg 110 vac it sayes lost shore ground, if shore cord is plugged into 220vac or two legs of 110vac systems check says no shore ground and reverse polaritie. Power comming in is fine with good ground. I don't think you could have reverse polaritie with 220vac as long as ground and neutral is in the right place. The rv has been run on one leg of 110vac for some time by previous owner and on the plug going into rv one leg has gotten hot and melted a little plastic at connection. Connection itself dose not look burned, I checked 2amp fuses going to circuit board and they were good. I also checked 12vdc going to circuit board and it was low at 10.5 vdc so I put on charger. Any help with this problem would be appreciated, tell me what you know! Thanks LEE
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Old 03-16-2014, 10:43 AM   #2
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Disclaimer: I am not a licensed electrician (studied in electronics...)
Reverse polarities means somewhere the neutral is crossed with L1 or L2. No shore ground means one of two things 1- No safety ground or 2- Neutral not connected. I think if neutral is crossed somewhere then it's probably 2 (System check not seeing neutral).
I suspect previous owner made some changes in the panel, disconnect everything until you find the problem!
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Old 03-16-2014, 11:22 AM   #3
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It would help to know what model and what year coach you have.

Also, what is this circuit board you are referring to?
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Old 03-16-2014, 11:56 AM   #4
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Which kind of converter-charger/inverter?
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Old 03-16-2014, 12:00 PM   #5
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First search online for basic home wiring details as you need to understand how it should be.

Get a volt ohm meter and learn how to use it.

Now open the ac load center and you will see 2 large wires comming into a pair of 50 amp breakers, this is your input power to the load center.

Ats for generator is before this point.

You will see a buss bar with white wires and another with bare wires.

These are your neutral and safety grounds.

Both bars should only have one type...all white and all bare or green.

Now connect shore coard to mh and get the shore end next to the load center.

On the connector you have l1 l2 neutral and safety ground.

Check connection with ohm meter from connector to load center.

L1 and l2 should be connected to the input breakers.

Neutral is the white wires bar and safety ground the one with bare wires.

Check this first and report back.

DO NOT DO THIS LIVE YET....

Check connections first so we know what is going on.
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Old 03-16-2014, 12:48 PM   #6
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My country coach will not accept 220v connections. I'm curious which models do. Tell us a bit more about your coach Lee.
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Old 03-16-2014, 01:47 PM   #7
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Quote:
Originally Posted by dons2346 View Post
It would help to know what model and what year coach you have.

Also, what is this circuit board you are referring to?
It is a 1995 country coach concept.
The circuit board I am referring to is connected to and branches off L1 and L2 and neutral / ground of the shore power and located next to the first contactor in line of the shore power.
The leads comming off the circuit board go to the voice system check circuit.
I have worked as a refrigeration tech most of my life so a multi meter is nothing new.
I have ohm out the 50 amp cord and nothing is shorted.
I wired in the 50 amp shore power connection box and L1 and L2 each have 120vac. Neutral and ground go to ground bar with good ground.
I ohm out the circuits at the rv shore connection and expect to get zero ohm,s across L1 and L2 but I get about 24 ohm,s of resistance. Is this normal?
Also the circuit board I'm referring to gets 12vdc from the batteries then sends out I suspect to the voice system circuit could my problem be low voltage on that circuit cause I found only 10.5 vdc to circuit board due to low batteries? I have batterie on charger now.
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Old 03-16-2014, 01:51 PM   #8
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1995 ccc

Rv in question
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Old 03-16-2014, 01:55 PM   #9
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Trying to post pic

One more time
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Old 03-16-2014, 02:06 PM   #10
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Is there a Surge Guard or similar component installed in the Coach between the shore power connection and the automatic transfer switch? The "lady in the box" will also indicate improper connection.

If the batteries are dead, and the shore power connection is faulty, you likely would not hear anything from the "lady in the box"

The Surge Guard should have indicator lights that tell whether there is a good shore power connection. The lights will be on a remote panel or on the Surge Guard itself.

If all is well there, the problem is likely at the transfer switch or beyond.

I doubt your battery situation affects the 110acv wiring. But those batteries are quite dead.... I hope you can get them to recharge.

Note: There are two 110vac legs into the coach and no 220vac circuits.

The 50A shore outlet at the post should NOT be wired as a 220vac outlet (and that is as much as I know!) There are examples of 50amp RV plug wiring on the web.
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Old 03-16-2014, 03:06 PM   #11
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Check out
Electrical Testing

and
http://www.myrv.us/electric/Pg/50amp_Service.htm

Print yourself out a copy .
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Old 03-16-2014, 03:20 PM   #12
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Tobais, if you are ever plugged to 50amp service then your Country Coach is accepting 220V service.

OP, I agree that you need a volt meter and should be checking your wiring. Without a neutral, stuff could get fed with 220 v while on 50 amp service and many of them will not like that.
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Old 03-16-2014, 03:58 PM   #13
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In any case, if you are seeing heat build up, I'd step it down to a simple 20Amp plug to maintain things until you get the 50 Amp plug sorted out.

If this coach does not have built in protection, I'd add one of the 50A all in one surge guard like protectors. They test for conditions that are not healthy to the electrical system, and will not pass it on in thru to the coach.

And OP - Saw your Concept yesterday on another post. Nice looking gal, such great lines of the era Concept. I tried to get a good friend to buy a very clean low miles (56K but very well cared for, indoor stored it's full life, one owner with extreme pride of ownership evidence by it's condition and the log with receipts all manually numbered to cross reference the log entry) out of the San Diego area. Probably 8 months ago now. He needs 36' for his parking area, and I kept trying to point out that this rolling gem of a classic was IMO better then say a newer model 36 'mid or entry' level coach.

Heck, I sort of wish we had bought it ourselves, and had it for local state park and tight spot camping. Would have made a deal with my BIL and a nephew, to use it and go along with us on trips - as it would have been fun to have them along, and not inside snoring in our RIG!!!!

Enjoy your classic!!

Best of luck on solving this one,
Smitty
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Old 03-16-2014, 04:44 PM   #14
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Quote:
Originally Posted by Hondalee View Post
One more time
Nice coach! Hope you figure this out.
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