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Pontiac Repair/wiring harness


what colour wire is a 12 volt+ accessory wire in the harness where the stereo is? i removed the factory radio and installed an aftermarket deck the deck only gets the 12 volts constant and ground from the wiring harness( it works like a radio does when the key is in the off position so it will show you the time when you push the power button and eject a cd) when i checked the pins in the factory harness and the after market one the pins don't line up so i need to either move the pin or splice the wires together, my problem is i cant find a good wiring digram for the car and my volt meter broke so its no help, the car is a 2005 Pontiac montana sv6.

Hi jeffrey:

that radio doesn't have an accy wire. the radio "wakes up" when the car starts up Via the serial data line for all the computers on the van. you will need to run a seprate wire from the fuse box on the right side of the dash to the radio for accy power. use a test light and see what wires are constant battery and which ones have power at key on. good luck ;-)

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Todd Puccio


General auto repair,electrical issues,driveability issues,anti-lock brakes,SIR systems,HVAC,engine performance,Gm specific. I have worked at my current dealership since the 1990 model year anything much older than that I have limited exposure to. I do not have very much transmission experience so those question you may want to ask of another expert. When you send me a question let me know the exact make/model/engine and year for the car or suv you have it makes it easier to answer the questions that way. If your happy with the answer I gave you please feel free to Donate. This is a free service to you and I am not compensated at all by this web site. I have 22 years of experience to share with you and my knowledge wasn't free to me. I had to pay for my education.


Experience in the area: I have been a technician in GM dealerships for over 22 years and I am a ASE master technician. I work at a Buick and GMC truck store Previously I worked at a Pontiac GMC store for 18 years. I Served a a lead technician when dealership was on a team system. I just recently moved to a Buick,Hummer,Saab Store when my franchise was purchased by this dealership. Organizations: ASE master technician


Education/Credentials:High school diploma,2 year vocational school degree 2 year college degree. Associates degree in applied sciences (auto technology)Awards and Honors: GMC master technician

Awards and Honors
Master GMC truck technician Master ASE technician in 9 categories

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