Get a cheapy volt/ohm meter & put it across the bat or hot term on the regulator or horn relay. If it reads about 12 volts you have a 12 volt system. Start the truck engine & rev the engine a little above idle. The voltage should go to about 14.0 volts on a 12 v. system or about 7.2 on a 6 volt system. If this happens your system is working & you know which one you have.


They say money can't buy happiness. It can buy old Chevy trucks though. Same thing.
1972 Chevy c10 Cheyenne Super
In the Gallery Forum