2007 Pontiac G5 OE Wiring Harnesses & Stereo Adapters Pontiac G5 2007, Factory Replacement Wiring Harness by Metra®, with OEM Radio Plug. For factory stereo. This high-quality Metra wiring harness is just what you need to replace your defective or aged factory wiring harness. Stereo wiring Diagrams 2005-2007 Pontiac and Chevy 2005-2007 Cobalt LS/Pontiac G5 Base model Car Radio Battery Constant 12v+ Wire: Red/White Car Radio Accessory Switched 12v+ Wire: The radio harness does not provide a switched power source. Run a wire to the fusebox for switched power. The accessory turn-on and amplifier turn-on are controlled by the class 2 serial network.
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