I installed the door latch mechanism, the outer cover, and the new Brothers door latch handle and window crank. Now it was time to finish up the wiring on the switches that go into the cab. I used a 12g power wire coming straight off the battery and a 20-amp fuse to protect the motors. If you choose to run it off the ignition switch it would be preferred to use a relay. Also, if you have kids, they can't operate the window without the keys in the ignition.