91 Dakota Headlight problem

[wingspan]

1991 Dodge Dakota 6 cyl Two Wheel Drive Manual 76,612 miles
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Both headlights quit working about a month ago at same time.

Headlights are good. Fuse is good. I replaced switch, didn't help.

There's 12V Dc to fuse and through fuse to Switch on terminals B1, B2 & B3.

Parking lights, dash lights and dome light all work fine.
( there on the same switch )

Everything else in truck works fine just headlights are out.
Vehicle is a California model bought here in Cal.

Is there a seperate circuit breaker some were in truck?

What else is in circuit after switch ?