I think the original gauge was 12. Also, the installation instructions for the radio called for hooking the radio up to the non-switched side of the ignition switch. I would imagine this is because the switch was not rated to take the current of the heater and the radio at the same time.


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!