It can be used on a negative ground truck but you'll need to visit the radio shop first for an evaluation. The original radios can go both ways (pardon the expression) but replacement transistorized components can not. You'll need to know whether that radio is the 6V or 12V radio also.
Check the number on the case:
22333396 (6V)
22333398 (12V)
This one year radio is so rare it can pass for steak tar-tar.
Keep that radio close cause it's VERY hard to come by.
