Had headlights, then high beam only, now nothing

There is no relay OEM. The functional path is.........tapped off the black ammeter wire "welded splice"............to the headlight switch....through the switch .........to the dimmer switch........out the dimmer on high and low beam wires...........through the bulkhead connector.............to the headlight harness..........split off to the two lamp connectors.........to ground somwhere on the radiator support