You check the the voltage going to the power unit? If you have a ohm meter check the resistance in the primary circuit if you find a spot with high resistance then focus on that area.


93 montero sr 3 inch body lift 31x11.50 super swamper ltb, 2 8inch 130 watt pro comp off road lights, 2 55w lights on the rear bumper, rear air locker, magnaflow exhaust muffler,superwinch manual hubs,15x8 black rock crawlers (steel)