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Interesting comments but... All coaches will light-up on shore power with the master power off because the converter is supplying the power to the coach's 12 volt fuse panel. In my coach, power for the latching relay MUST come from the batteries. That is why, if the house batteries are below 9 volts, you will hear a click, but the relay will not latch. Put an external charger on the house batteries and you have enough voltage to latch the relay. You have to have enough power (wattage) to let the solenoid to push against the spring to rotate the relay's cam. There is a five amp fuse in the activation wire going to the latching relay, so if you hold the switch (button) too long it will not burn-out the solenoid in the latching relay but burn out the fuse.
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Jim & Roy Davis
2016 Hurricane 31S
1961 Rampside in tow
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