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Open Roads Forum  >  Tech Issues

 > Elec prob in mallard rv - tripping breaker/hot - help?

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fatbull

Missouri

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Posted: 06/26/11 10:33am Link  |  Print  |  Notify Moderator

Hi.

I have an 86 Mallard 5th wheel that I recently ran into electrical problems with and am looking for advice where to go next.

We pulled into the park and plugged into 50mp service and the breaker for all receptacles except the microwave tripped almost immediately. Prior to tripping, he converter box also made a really loud humming (much louder than normal) noise and smelled very hot.

All other circuits seem fine.

I have made sure the breaker is not weak by swapping it out. It is fine.

Does anyone have any advice on a next step to determine if the problem is a short in an outlet or if the converter itself is bad?

Thanks is advance.


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wolfe10

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Posted: 06/26/11 10:37am Link  |  Print  |  Notify Moderator

IF YOU ARE SAFE WORKING AROUND ELECTRICITY:

Start by verifying that the outlet is properly wired and providing the proper power. Something like an open neutral could reek havoc with your electrical system.

With a voltmeter:

Either outer straight (hots) to center round (ground) or center straight (neutral)= 120 VAC +/- 10.

Outer straight to outer straight (hot to hot)= 240 VAC +/-10.

Next would be to check inside your trailer to verify same and confirm that the shore power cord is OK.


Brett Wolfe
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EX: 1993 Foretravel 36' U-240


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Kirk

Livingston, Texas.

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Posted: 06/26/11 02:22pm Link  |  Print  |  Notify Moderator

If all of the breakers tripped at the same time it sounds as though you may have connected to 240V where there should be 120V. Are you sure that outlet is correctly wired? A 50A outlet that has no neutral will apply 240V to your RV.


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fatbull

Missouri

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Posted: 06/26/11 10:50am Link  |  Print  |  Notify Moderator

Power supply at the pole is good. Wil check inside asap.

We've never had any trouble with it, and are the 2nd owners, so I'm sure it 'was' wired correctly; all
Is still original. we've either developed a short or something is worn out.

Artum Snowbird

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Posted: 06/26/11 10:46am Link  |  Print  |  Notify Moderator

Check the supply as above, and one more check.

Check from the neutral to the ground. If you see a voltage there, it is not wired properly as Brett says above.


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Posted: 06/26/11 10:58am Link  |  Print  |  Notify Moderator

Start by checking for an open neutral into the rig.


Bud
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Wayne Dohnal

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Posted: 06/26/11 05:12pm Link  |  Print  |  Notify Moderator

I'll vote with the "open neutral" crowd, and you might also have a few burned up electrical devices as a result.


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fatbull

Missouri

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Posted: 06/26/11 03:39pm Link  |  Print  |  Notify Moderator

No, all breakers did not trip. It has Bryant breakers in it, a lot like household breaker box. There are 4 breakers in the box - 30amp main, 15 amp that runs the microwave outlet only, a 20 amp for the ac, and a 20 amp for all of the electrical/110 outlets in the camper.
ONLY the electrical/110 outlet breaker is tripping.

When you plug the rv in, and flip on the main power, the converter makes a very loud grinding/humming sound, gets hot (hot enough to melt the wire coating), and trips the breaker. The whole process takes maybe 15-20 seconds.

fatbull

Missouri

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Posted: 06/26/11 07:43pm Link  |  Print  |  Notify Moderator

My bad, we were plugged into 30amp rv service. Since I've been looking at it, I've plugged into a couple of different 'known' poles just to be sure and I'm sure the service has been adequate.

suchristo01

San Diego, CA

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Posted: 06/26/11 07:10pm Link  |  Print  |  Notify Moderator

fatbull wrote:

No, all breakers did not trip. It has Bryant breakers in it, a lot like household breaker box. There are 4 breakers in the box - 30amp main, 15 amp that runs the microwave outlet only, a 20 amp for the ac, and a 20 amp for all of the electrical/110 outlets in the camper.
ONLY the electrical/110 outlet breaker is tripping.

When you plug the rv in, and flip on the main power, the converter makes a very loud grinding/humming sound, gets hot (hot enough to melt the wire coating), and trips the breaker. The whole process takes maybe 15-20 seconds.


Stop! Do not olug that shore cord in again! Read what you wrote 30 AMP MAIN In your original post you said you plugged in to 50 amp service.Does your shore cord have 3 or 4 male prongs?

All contributors have assumed you should check for two legs of 120v.A neutral and a ground. That rig cannot begin to handle that with the service panel you describe.You should have a shore cord Travel Trailer nema, not a regular stick house 30 amp with three prongs.

RV Electrical

And do not let anyone tell you a 30 amp RV and sitck house 30 AmP are the same.


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