looks like you have one fuse that supplies hb & lb relays so if you have hb fuse must be ok.
Trace back from bulbs,next thing on loom is relays, both have 4 wires to them, lb one has white trigger wire( comes from switch), green wire (earth) , white wire with black trace(power to lb filaments), black with red trace(main power feed from fusebox for relays).
Put test light /multimeter on terminal with white trigger wire , making sure switch is on low beam, should have 12v, if ok possibly relay stuffed,
Check there is power at terminal with black wire/red trace.
Cut short peice of insulated wire and strip ends,remove white trigger wire from terminal and use jumper wire from terminal with black wire/red trace to terminal you removed white wire from,if low beam lights up you have a fault in trigger wire which goes back to switch gear.
Test wiring between relay and headlights by using your jumper wire between black/redtrace terminal and white/black trace terminal,
low beam should go as this bypasses relay and trigger wire.
Be careful with the jumper wire not to short it out onto chassis etc
Make sure you have a good earth with your multimeter/testlight.
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