The truck will not do anything as if the battery is dead, actually the horn does work but that's it. The battery has 12.4V, all fuses & relays test good, checked all connections at SVM. There is no voltage at plug to dash display and since I don't have a wiring diagram or schematic for this truck was hoping someone could steer me in the right direction to pinpoint the problem.
Model - glc050vxnvse094
Serial - a910v03216c

Thanks for any help,
Dino