I actually just ran into this same exact problem yesterday. I had tested to see which two lines were producing power, I cut the blue and white wire then connected it to the red and black wire. I got power, but I got power all the time even when the truck was off. So I reconnected the factor...
98 GMC Sierra Z71 - Purchased September 2014
3" Body Lift, 35x12.50x20 Coooper Tires, 20x9 VROCK Wheels
Flowmaster True Dual Exhaust - header back
Plus All The Extras...
The roof is vinyl wrapped in matte black. - thinking about switching to gloss black.
Just about everything was...