[healthservices]

Originally Posted by healthservices

There's the possibility that the positive cable is lying on a ground preventing the circuit from completing, maybe just applying 12 volts to the side of the fuse that goes to the door locks may work. Otherwise try pulling the switch and apply 12 volts there.

Note: and this is important, not only is the 12 volts positive important, make sure the ground is at a good place too.