2004 GMC Sierra 2500 Stereos

Metra Electronics Car Stereo Wire Harness: Aftermarket Radio Wire Harness for Non Amplified Models, AAPWHGM2. N

GM Genuine Parts Wiring Relays are designed, engineered, and tested to rigorous standards, and are backed by General Motors. These relays help connect or disconnect power to a vehicle accessory when it receives a low voltage signal from a switch. GM Genuine Parts are the true OE parts installed during the production of or validated by General Motors for GM vehicles. Some GM Genuine Parts may have formerly appeared as ACDelco GM Original Equipment (OE).

Metra AAP555GM installation kit replaces the OEM radio with an aftermarket radio for General Motors 1995 to 2012 models. This kit replaces the OEM radio and allows an aftermarket radio to be installed in the factory radio locations. This stereo installation kit has been engineered to help you install a 2 inch tall (Single-DIN) or a 4 inch (Double DIN) aftermarket radio into the original vehicle dashboard, making radio replacement simple. The dash kit is designed to match the original look and feel of the vehicle dashboard. Installing an aftermarket radio can upgrade the sound quality and provide additional features the original factory radio could not offer but requires this dash kit to make it fit.

Metra Electronics Radio Interface: Retains Factory Functions for Steering Wheel Control, AAP-GM11-SWC. N

Relays are electrical switches used to convert a small electrical load into a circuit capable of handling a high amperage load. Computers and small switches are not designed to carry the higher amperage requirement of a circuit that may have an electric motor, solenoid, or high amperage lighting fixture. Within a relay are contacts that are controlled with electromagnetism, when the circuit switch commands the device on or off, magnetism will pull or release the contact arm closing or opening the contacts within the relay that carry the voltage.