I have a 2004 CTS-V which I have been doing a stereo upgrade on. I installed a new 200 amp alternator, upgraded the big 3 wires, new optima battery and new belts. I also ran some new wires through the exsisting firewall for some amps in the back.
I finished the job and put everything back together and now I have no accessory power at the switch. The lights work, seats move and power door locks work but when I turn the ignition switch, nothing happens, no power whatsoever. I can hear the relays clicking in the rear fuse panels as if it's trying to get power but nothing happens.
I've checked every fuse in the car and tested power at all of the fuse panels. There is 12 volts at every fuse box and none of the fuses are blown (I even tested the fuses with the voltmeter to make sure they were fully functioning). I also looked for any loose grounds that I could think of and found nothing loose.
Could the PCM be preventing the car from getting power at the ignition switch even though there is power throughout the car? Could the alarm system be preventing power for any reason (the factory key fob works fine)? Is there anything I'm not thinking of?
My next step this weekend is to test the leads at the actual switch. Other than that I'm at a loss. Any help would be appreciated!!