On my Duramax i finished building and testing now it's installed. My version of the cargo light on in drive also has reverse lights tied in. It stays on without having to hold the button down.
Nearly completed the 2wd low differential unlock harness.
Ordered the pins I need to put the wires in the headlight switch for the factory Off-road light button. Then I will finish building the latching relay setup for that so it will be ready when I get whatever Off-road lights I decide on.
Two reasons.
1. More light to see the trailer and load behind you when pulling a trailer.
2. When the A-hole behind you won't turn off their high beams you can give them a reminder flash.
Successfully made a harness to allow the cargo light and reverse lights to come on while in drive and stay on until you turn it off with the factory cargo switch. Now i just need to get it put in the truck.