I'd set everything so that the headlights should be up, and then remove all of the headlight up/down relays and take a volt meter to check each single socket for 12V. If there's no 12V anywhere that's a good place to start. Then do the same thing with the headlights down. Headlights can go up and down without ignition, so there's 12V around constantly in the up and down retract circuits.
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