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Check or replace the headlight relay first (note it's 5 pin relay not a 4 pin like the others and works as two relays one for hi-beam one for low beam and one half of the relay can fail). Third from the front near the coolant recovery tank. Also clean the relay plugs and socket with contact cleaner lubricant (NOT WD 40 or similar); coolant tends to get spilled there and forms a green corrossion barrier to the current. This stuff will do https://www.autobarn.com.au/motortech-contact-circuit-board-cleaner-400g although I prefer this http://www.altronics.com.au/p/t3061-contact-cleaning-lube-aerosol-175g/ or https://www.jaycar.com.au/contact-cleaner-lubricant-spray-can/p/NA1012 You can also scrub the prongs on the relay with a steel wool or a wire brush but reapply the contact cleaner lubricant after to give a layer of protective lubricant against further corrosion.

If that is OK check circuit breaker that sits between the relays near the coolant tank has not gone permanently open circuit. Rectangular two pronged metal box. Similar to this: FORD EL EF FLACON 12V 30A C8 2-PIN 2-WIRE ENGINE BAY SILVER FUSE | eBay Ditto with also applying contact cleaner lubricant here.
 
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