Well, I pulled a wiring diagram for an aftermarket stereo, basically was just looking to see which wire was the 12v Ignition wire so I could hook that to my computer when I get it installed. On this, it says I need a CAN BUS adapter, and there's no 12v ignition wire supplied to the factory stereo???? Is there a wire in the ignition harness, or somewhere else that a 12v source is supplied when the Key is only in the ON position???

 

cant you use the cigarette lighter for 12v power ?

 

Sounds like a good option... My '03 has this harness under the knee bolster which has a switched lead. I use it to power the relays for my driving lights and engine cooling fan. The harness is four wires. The switched lead is lime green/blk stripe. I DO NOT know how much current this lead is rated for, so your first best choice is the lighter. If it is not switched, the dealer may be able to reprogram it. My 300C's lighter can be set for hot always or only with the key. I wouldn't be surprised if your truck can as well.

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