jatPPV2012
Member
Welcome from Iowa.
until you can get your hands on the FSM, Here is a link to the wiring diagrams from www.gmupfitter.com for your year of vehicle.
https://www.gmupfitter.com/files/media/photo/484/2012_LD_ElectricalPickupsChassisCabs_100813.pdf
https://www.gmupfitter.com/files/media/photo/460/2012 Police Specifications Manual 9-29-11.pdf
Great! Thank you. Appreciate the link info.