Prior to (I think) 2008 the convertor is located right behind the breaker box (bed base). After that we started "remote mounting" the converter due to noise in the rear storage compartment.
Do you really need to run the wire to the converter? Or just a new wire to the 12V line that was feeding it originally? I'm guessing you need to wire it to the fuse panel/breaker box in the bed base.
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