old Mack trucks and some jaguars has positive grounds.

https://www.ecklers.com/power-inverter-positive-to-negative-ground-6-to-12-volt-1-3-4-cube-3-5-to-5-amps-output-28-20693-1.html?T5_Var4=28-20693-1&srsltid=AR57-fCyvn9EwzgrIgwq-qR9hStoydOarNXjsEWpvDUnaZF7t9WtkoK6_A8&utm_content=Electronics%7CCustom+Autosound


1960 Chevy C10 gasser- Rabble Rouser
1953 Harley Davidson Panhead chopper