4 wire connector doesn’t have a power wire - only has wires to run the tail lights. You need to provide wires for power and ground. The ground wire in a 4 wire setup may not be suitable for use with a charger. You probably need to have your rig set up with either a 7 wire or 6 wire plug
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Rick
2017 Thor ACE 30.1
2017 Jeep Cherokee Trailhawk
Roadmaster Falcon All Terrain
RVi Brake 3
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