thomasgibbens Posted August 31, 2020 Share Posted August 31, 2020 I have an issue with my auto transfer switch. It will not close in on shore power. I checked the voltage at the pedestal and at the incoming lugs of the normal power breaker in the switch. Both show 120 volts line to neutral but nothing on the load side of the breaker. I can run the genset and have power but when I shut it down I have no shore power. Any suggestions? tomgibbens ’15 Dynasty Link to comment Share on other sites More sharing options...
Dr4Film Posted August 31, 2020 Share Posted August 31, 2020 What brand/model auto transfer switch do you have? Link to comment Share on other sites More sharing options...
Onthego Posted September 1, 2020 Share Posted September 1, 2020 It could be a latching relay in the transfer switch box will require testing with a volt/ohm meter. If shore power is present the coil on the power relay closes contacts sending voltage to the Inverter and the fuse box. There is a power relay for the generator it wont latch if shore power is present. Or it could the reverse, Link to comment Share on other sites More sharing options...
Dr4Film Posted September 1, 2020 Share Posted September 1, 2020 FYI, some ATS switches are setup where the shore power relay is closed by default and only opens when the generator is running. Then the generator relay closes to send power into the coach from the generator. Hence the reason for my previous question. Link to comment Share on other sites More sharing options...
thomasgibbens Posted September 1, 2020 Author Share Posted September 1, 2020 My switch is a Surge Guard Link to comment Share on other sites More sharing options...
Dr4Film Posted September 1, 2020 Share Posted September 1, 2020 Here is the web site for the series of Surge Guard Transfer Switches. Select the model that you have then scroll down for the Troubleshooting guide. https://rvpower.southwire.com/products/transfer-switches/ Link to comment Share on other sites More sharing options...
bobdinsmore Posted September 1, 2020 Share Posted September 1, 2020 It could be as simple as a contact needing a little polishing which may be able to be done without having to do anything more than removing the cover. Just slide the edge of a cotton tee-shirt back and forth between the relay contacts: quick and simple, maybe avoiding more time and work. Bob Dinsmore 2000 Diplomat Link to comment Share on other sites More sharing options...
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