Lippert Stabilizer Jack Switch Wiring Diagram. The electric jack switch with harness for lippert stabilizer jacks # lc387874 referenced in your question will have 4 wires coming from the unit. In the main frame rails, in the (a) positions in the above diagram.
Lippert 298707 electric stabilizer jack kit with black waterproof switch kit. Black, red, yellow, and blue. It is important that the electrical components have good wire to chassis contact.