Ok I am debating on doing the grey wire mod, but I sometimes loan out my truck, and don't want anybody who is using it to accidently hit the rear locker while they are driving because of the damage it would cause. My question is could I just use one of those connectors that clips onto wires, and clip it onto the grey wire, and run it to a switch, and then from the switch to the ground, so when the switch is off, it will be hooked up to whatever its normally hooked to, but then when I switch on the switch(not the locker switch) its then run to the ground. My question is by doing this, it will be connected to the ground, and whatever else it was origionall hooked to. will this cause a problem? What is the grey wire originally connected to? some kind of mechanism that grounds it when you are in 4X4 low?