I never wanted to do this mod because I was non fond of cutting a factory wire! So I figured out a way to do it without cutting it. Actually two ways. First way remove grey wire from the modular plug then I found a modular plug in the same area not in use I think its for the factory security system. So I removed one of the wires from the unused modular plug and cut it back 6 in. Then inserted it were I removed the grey wire from the 4wd mod plug and put a ring terminal on other end. When I reinstalled the 4wd control box I just put the ring terminal under the bolt for ground perfect and neat! Second way is remove grey wire from modular plug put shrink tube over end to protect. Now open the black 4wd control box and slide out circuit board (very easy to do) Now on the back of the plug on the circuit board on the bottom row of metal strips from plug solder a jumper to connect the two middle ones. One is from the grey wire the other is a ground. this is a very neat and professional way to do it! My only word of caution is taking the wires out of the modular plugs is a BITCH.