It's listed for various 12 volt 30 amp applications, 1956 Corvette, 61 Studebaker, 58 Chevy Impala, etc. Definitely 12 volt Neg. ground.
Jerry


"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!