Start by locating the primary relay beneath the hood near the fuse box–positioned adjacent to the driver’s side strut tower. The relay controls both the high-speed and low-speed cooling.

Start by locating the door control module–typically positioned behind the driver-side kick panel. Pin B5 (violet/black wire) carries the 12V reference signal; test it first with a multimeter. If.

Locate the amplifier harness behind the rear seat on the driver side–pin C1 (gray connector, 24-pin) carries the RCA-level signals directly from the head unit. If bypassing the stock.

For precise aftermarket integration in your late-model GM pickup, secure the Dim Grey wire (factory radio memory feed) to an always-hot 12V source – splice directly into the ignition-switched.

Start by locating the primary harness connector beneath the driver-side dashboard–it’s a 12-pin plug labeled C1. Pin 3 delivers low-beam power (12 VDC, ~5 A), while pin 5 handles.

For accurate electrical troubleshooting, start with the engine compartment fuse block under the hood near the driver’s side firewall–this is the central hub for high-current circuits. Pinpoint the black/white.

Install the 7-pin connector by stripping each wire to 5/16″ of exposed copper, then crimp the matching terminals with aclosed-barrel crimper rated for 14–12 AWG. Route the harness through.

For the GM 1500 series pickup models from this production year, the factory audio harness follows a standardized pinout configuration accessible behind the dash. Locate the 20-pin connector–typically black–attached.

Locate the purple wire at the factory harness connector–this carries the starter signal. If voltage drops below 10.5V when cranking, trace the black/orange ground feed next; corrosion here mimics.

Begin by locating the main power feed from the battery–typically a thick red cable terminating at the solenoid. On Chevrolet’s heavy-duty models, this connection often splices into two branches:.