On the factory fuel pump wires that run inside the car to the back, which is the ground wire? I know the POS wire is the brown wire I need to know which is the NEG wire.
Not sure if this help's but here's the schematic. It shows the ground from the fuel pump as blk/wht where it grounds at G177 which is in the trunk. If you're looking for this wire inside the cab you won't find it.
If I'm understanding the question the ground, unless switched or relayed would just go to the nearest ground, which as noted above looks to be in the trunk.
Actually I've thought about putting a kill switch in the trunk myself. One more lock to get past to get to the switch... if you know it's there. I don't have remote trunk release.