12v Trailer Wiring Diagram June 10, 2019 24v truck with 12v trailer . I am sure it has been addressed on this sight before but here is a helpful schematic I found for wiring your 24v truck to run 12v trailer lights. You www.benzworld.org Fan Speed Switch Wiring6 2 With GroundBoiler Control Panel Wiring DiagramDeh P3100ub Wiring DiagramThree Switch Light SwitchWiring Multiple RelaysCeiling Fan GuidelinesHome Wiring Guide