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Old 02-07-2016, 07:48 PM   #1
Senior Member
Join Date: Aug 2015
Location: Wasaga Beach
Posts: 329
Diagnose bad ATS

Trying to figure out if I have a bad transfer switch or not.

I have a PD52P in the trailer and the genny side is connected to a 15a plug with both hot sides tied together (same as a 30-15a adapter would do as far as I know). I'm in a park in CA and was running fine on the 50A shore cord last night and then this afternoon I had no AC power in the trailer. When I had hooked up yesterday I was unable to get the 50A plug to fully seat into the receptacle, when it went out today I wiggled it and got it to seat but the was an arc in there. Park guy cam and reset the breakers a couple of times and it drew pwr from the 50A again but quit a few minutes later. If I use the 15A recep on the pedestal and feed into the 15A plug I put on the genny side (I use that to plug into my inverter) the ATS clunks and I get AC in the trailer.

So, the question is, should the shore pwr side of the ATS clunk when pwr is applied? Should the green light be on if I have AC on the shore side but no clunk? The genny contactor pulls in after the delay and with no AC connected anywhere I can push the contactor movable part by hand, not so with the other side. Seems to be a bit of a smell from the unit too. Maybe my shore side contactor killed itself.

Thanks for any info and help.
2017 Chev 3500HD CC SB SRW
2011 Ford F350 CC LB DRW (traded)
2014 Eagle Premier 361REQS
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