adventurenali92
Full Access Member
That’s interesting! I didn’t know that! I’m curious, do you think it’ll have any affect on the shifter side of the wires?Truth be told... they are probably both negative.
One probably goes to ground/negative and the other side probably goes to the BCM and when you press the tow haul button it just grounds that wire temporarily which the BCM interprets as a signal.
Very common on GM vehicles to use a ground signal to turn things on and off.