Its not a 12vdc transformer, its a ac powered 12vdc power supply and battery charger. There should not be an outlet before the ats for any reason. That would mean your outlet is only breakered (fused) at the 50 amp power pole. Remember a 50 amp connection is 50 amps each leg! The ats is a solenoid, sometimes they don't energize correctly, just like in a car starter, tap it with a hammer it might switch. If however the surge protector is showing no power it is fried and not repairable. Test it plugged in directly.
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Mace with 2018 Thor ACE 30.3
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