Depending on the amperage rating, you could blow an internal fuse.
The headlight circuit breaker is intergrated with the headlight switch.
the circuit breaker is built into the headlight switch.
It constantly "drains" the circuit
Back then the headlight circuit was protected by a circuit breaker that was built into the headlight switch.
The circuit breaker for the headlights is intergrated with the headlight switch.
There is no fuse for the headlights in that truck. The circuit is protected by a circuit breaker located inside the headlight switch.
No headlight relay listed. The headlight circuit breaker is integral with the headlight switch.
In the breaker box
Don't know of a headlight relay but the headlight circuit breaker is located in and part of the headlight switch.
There is no headlight relay. All the switching is done in the headlight switch including a circuit breaker.
The headlights are not fused. The headlight switch has a built in circuit breaker.
When checking continuity in a series circuit, you put your leads in series with the circuit or device being checked. You also make sure the circuit is deenergized and that it is open.