1971 duster
On these cars there was no headlight relay. The power goes through the headlight switch. That said, making or buying a relay harness is a good way to get brighter lights and reduce the electrical load on the original connectors.
Schematically the factory headlight circuit looks like this:
Power from the alternator (unles the engine is off) goes to the headlight switch's B1 terminal.
With the switch pulled all the way out, electricity flows to the hi/low switch on the floor, then to the multiconnector on the firewll and on to the headlights.
( there is a 15 amp circuit breaker built into the B1 circuit of the headlight switch.)
On these cars there was no headlight relay. The power goes through the headlight switch. That said, making or buying a relay harness is a good way to get brighter lights and reduce the electrical load on the original connectors.
Schematically the factory headlight circuit looks like this:
Power from the alternator (unles the engine is off) goes to the headlight switch's B1 terminal.
With the switch pulled all the way out, electricity flows to the hi/low switch on the floor, then to the multiconnector on the firewll and on to the headlights.
( there is a 15 amp circuit breaker built into the B1 circuit of the headlight switch.)