I believe GMC used a positive ground system at the time. If that is true then one thing should be noted. The original radio had a mechanical vibrator which could be used in eithe polarity. However the solid state vibrators are polarity specific.


1951 GMC 1 Ton Flatbed -- It is finally on the road and what a great time I have driving it!
1951 1 Ton Completed


My Chevy Master 4 Door is on the Road!