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Before you replace the relay (and that very well may be the problem) make sure your coach batteries are not dead. The relay does not work unless there is enough voltage in the coach batteries to make it activate. When you plug the coach into shore power the batteries look like they have power because it is being fed by shore power thru the converter/charger and the use/store switch will work as will all your 12v systems. If the coach batteries are not taking a charge, when you disconnect the coach, the batteries can no longer activate the use/store switch and you will have no lights or radio. Good idea to check this first before you pay for replacing the relay. If you plug it in again to shore power and the Use/store works and you have 12v power, then unplug and check the batteries.
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