You would have to look into the wiring and power supply, to the switch . If the chassis batteries are down and the switch gets it's power from those batteries, it might not be getting enough to activate the relay. Might have to hook up a separate switch from house power to activate, in that situation.
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99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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