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Old 10-25-2021, 03:05 PM   #1
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Monaco Owners Club
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No Power transfer

I got the 120 Amish unit. When they took off the water line for the ice make (in outside panel it needs a piece about 6" long. Unfortunately, when they shut off the valve, it leaks. Hence the problem.
Water leaked out and I didn't know. When I opened the basement the next morning, the doors were full of water and water in the bay where the power transfer electrical boxes are. I don't know what it is called. Anyway, the genny runs but no 120. Turns out there is power from the genny to the contactor inside the box. It looks like the red and white wires to the contactor coil go out the bottom to the other box (that has 2 big glass fuses). Any one know where they go? I don't know how to test the transfer box without a 50 amp hookup. My coach is in storage, only 110 there.
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Old 10-25-2021, 03:35 PM   #2
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Amazon, RVUpgrades and other RV retailers sell transfer switches. Look on yours for specs to match. Also pay attention to the orientation, ie. input on top or bottom, house side/top or bottom as that avoids not having enough cable for connecting to the proper side of the relay contactor. Some transfer switches can be repaired by simply replacing the contactors assuming yours does not have any EMS functions. M&M Electronics rebuilds some of those.
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Old 10-25-2021, 03:49 PM   #3
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Thank you. I saw a video on on installing and he said the contactor (it is a plain GE 40 amp contactor) for the genny was normally closed. Mine is definitely open. I gather, from what you said, I can just replace the contactor? I don't know what EMS means? If it means electronics in the box, there are some. I guess for the delay. Thank you for the help.
My son was checking it for me and said there was no power to the coil, but he has never seen one, (he's a mechanic). If it is normally closed there shouldn't be power to it.
Oh, is the coil on the contactor 120?
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Old 10-25-2021, 03:49 PM   #4
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May also be the time delay board in the switch, which is replaceable on some ATS.
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Old 10-25-2021, 04:29 PM   #5
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The transfer switch routes electrical power from either the generator or the shore power cord to the main circuit breaker panel in the coach. If you have power from both sources, the generator takes priority.

It sounds like you have found the power transfer switch in the basement. I'm not sure leaking water can affect it, but maybe.
Our coach has an Esco ES50-65N transfer switch. Ours was noisy and I asked the Esco technician about it and he recommended a newer model: Part Number LPT50BRD.

Instead of replacing the box, I sprayed the contacts with Hosa DeoxIT spray. This quieted it down and it works much better now.
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

Be careful working in there. There are up to 240 volts at 50 amps per leg so it can be dangerous. If you are not comfortable with electrical, find a good electrician (even a residential electrician) and have him check the tightness of each connection and clean it with some DeoxIT.

Another thought. Make sure you trip and reset the circuit breaker located on the generator.

Good luck!
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Old 10-26-2021, 11:53 AM   #6
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Thanks Vito. I see electronics in the box, i don't know if water could get in. There is power to the gen contactor inside tbe box, but the contactor is open. I am getting a new ATS delivered today. They aren't expensive, and I'd trust the New surge guard better anyway. Thanks!
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