The headlight switch is a multifunction switch.
Power at the B1 terminal is only to feed the headlights
It has a 15 amp breaker.
Power at the B2 terminal feeds the parking and marker lights.
View attachment 1715571651
Internally B2 also connects to the rheostat.
Power out from the rheostat is wired like this
View attachment 1715571644
The wiring for the instrument lights goes to a lower current fuse.
Finally there is a connection for the dome/interior lights. This is a ground connection just like the door switches.
In sum, there are three hot wires connected to the headlight switch.
