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Old 05-03-2014, 10:46 AM   #1
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Newmar Owners Club
Appalachian Campers
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Location: Vero Beach, Florida
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Electrical problem

Neighbor has a 50 amp system in his rv.
When he plugs in to his 30 amp outlet with an adapter he has 110 volts in about half of the rv.

With generator running he doesn't have any voltage even after switching the circuit breakers on the generator.

Any suggestions?
Denver (Deerhunter)
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Old 05-03-2014, 11:03 AM   #2
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Location: Powell River, B.C.
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First , I'd check continuity , in his 30>50 amp adaptor .
Second , we'll need more info on his unit and the problem.
New problem ?
Only at his house ?
Ok at a park with 50 amp power.?
Has the gen set provided good power before ?
Has he checked all the GFIC's ?
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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Old 05-03-2014, 12:05 PM   #3
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If he has an inverter some circuits may be routed through it. In that case I would check the breaker/s on the inverter.
Clay WA5NMR - Ex Snowbird - 1 year, Ex Full timer for 11 years - 2004 Winnebago Sightseer 35N Workhorse chassis. Honda Accord toad.
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Old 05-03-2014, 02:14 PM   #4
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Electrical problem

Typically 30 amp is "heavy duty" 110/120 volt. 50 amp is 220/240 v with two 110/120 legs. So the 30 - 50 adaptor powers each of these legs from the one. I would suspect the adapter is defective. You could do a simple continuity test on it and any extension cord you are using. If it is ok, test starting at the 30 amp outlet, then the adapter, and so on. Do polarity too. Just work from the power source out to find the fault. But, if the generator is running and not providing power it could be the inverter or diodes. One motorhome we had would feedback from the generator to end of the mh's extension cord and trip the breaker. We had that fixed, bad switching diode.
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Old 05-03-2014, 04:49 PM   #5
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Location: Silver Springs, FL. USA
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Agree - his 50/30 adapter is defective and only powering one "leg" of the 50A system.

The generator issue is different. Most likely his auto transfer switch isn't working (or he doesn't have an auto transfer switch and must physically plug the shore cord into the generator).
Gary Brinck
Former owner of 2004 American Tradition and several other RVs
Home is in the Ocala Nat'l Forest near Ocala, FL
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