1960 Valiant Headlight Fuse

There is no fuse. The light switch has TWO separate power sources. The fused source supplies the tail lamps and parking lamps, and feeds to the dash dimmer switch.

The headlights are powered by an UNFUSED tap off the "welded splice" in the black ammeter wire under the dash. The light switch has a breaker in/ on the switch

The "path" is ammeter black wire---welded splice--light switch--breaker--through switch and out connector--to the dimmer switch--select hi or lo beam and feed out through the bulkhead connector to the lamps

The way to troubleshoot this is to check right at the dimmer switch. If no power there, pull the light switch.