You have a bigger issue than the ground...the stock radio is most likely 6 VDC, and not 12 VDC. I would ask the question, "why do you want a stock radio?". The truck is already been modified for 12 VDC so it's not still original, why bother with a stock radio. If it's merely for cosmetics, then look for one of the newer radios that have a "stock" faceplate but modern electronics...seems to be the best of both worlds. Good luck...