So I rewired much of the trailer and switched over to a PD 4100 recently. Everything is great... except for the water pump. When I hit the switch all the lights
immediately shut down and the volt meter drops to 4. Needless to say, the water pump does not fire either. This "blackout" lasts 5-10 seconds and then everything goes back on and voltmeter reads normal. A couple of points:
-- Fuses are all intact.
-- pump worked fine before the conversion.
-- I did not touch the wires at the pump end.
Thoughts? Would reverse polarity cause this?