Any typical vehicle has multiple wire harnesses. Need to know the symptoms your having.
There are several wiring harnesses in any vehicle. Need more info as to what your symptoms are.
gm/Pontiac radio harness
the dealership for that brand of car
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it should be the blue and white wire
The Pontiac Grand Prix goes by the GM Factory Wire Harness Color Codes. http://www.installdr.com/harnesses/GM-Wiring.pdf
You can find the wire harness for the 2007 Silverado Classic at most Auto Zone stores or online at Auto Zone. You can also find this part online at Amazon or Parts Geek.
I spoke with a technician at Scosche 1(800)621-3695, and he said the wire harness that was needed is a GM07, there is no need to buy a $150.00 stereo wire harness, because the only bonniville's that support that harness were the 2005 and up models. just in case your wondering the dash kit model # is GM2049, that is for a 2000 Pontiac bonniville.
On my wife's 2007 G6 GT It was on the battery side near the wire harness. It is a flat cord with a 120 V grounded outlet plug with a rubber cap that had "Phillips and Temro Ind" printed on it.
The lower right side of the firewall. There is a wire harness grommet already there it's tight but I got a 0 gauge wire through by greasing the wire first.
when you buy the harness to wire in, the intructions for correct wiring will be on the harness packaging
Is it possible to narrow down the circuit? There are quite a few. i have personally worked on a 92 3800se and rebuilt the wiring harness. the best place i could figure to get wire schematics is to bug the guys at the local Pontiac dealers body shop. it took 20 min of hassling but i managed to get print outs of the schematics. the following are the various harnesses. -body wire harness -dash harness i should note that those are the main harnesses. however they are sub classified as everything from power locks/windows, engine compartment harness, instrument harness, ect....