There are several circuit breakers in that vehicle, need to know which one you are looking for.
Back then the headlight circuit was protected by a circuit breaker that was built into the headlight switch.
The headlight circuit breaker is intergrated with the headlight switch.
There is no headlight relay. All the switching is done in the headlight switch including a circuit breaker.
You need a breaker rated for 10 amps and 250 volts. The breaker must also fit properly in your panel.
If there are not "short's to ground", you probably have a faulty circuit breaker for the headlights.
If you are talking about a breaker in a house panel then a 15 amp breaker would be used. It is the smallest amperage breaker that you will find in a house panel.
A 30 amp breaker wired with AWG #10 wire.
A #10 wire has the capacity for 30 amps. No breaker larger than 30 amps should be used to protect the circuit.
60amp
30 amp wired with AWG # 10 wire.
It is built into the headlight switch.
Depends on what you have connected to the circuit. It is less than 10 amps or the breaker would trip. A rule of thumb is you design for about 80% load related to the breaker. For 20 amps that would equal 16 amps.