The ECTED comes with a bulkhead fitting for the wires which can be run through the cast housing of the axle. But we think future disassembly will be much easier our way. We used a die grinder to cut a notch in the diff cover mounting surface for the ECTED wires to run through. A little silicone seals the cover and the wire notch. Be sure to run the wires up and out of harm's way to a switch in the dashboard and a fused 12-volt source.