Check both ends of the tail ight fuse with a test light. Seen a bunch that the lead strip looks good but the solder has turned lose from the end cap.
Then it's just check for power in and power out on both circuits, headlights and tail lights.
And I would jump straight to the dimmer switch to check for headlight power coming from the switch. Might just be a terminal worn out or burned up from old age.
Clay
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