Headlights go on and off when engine is hot

^^^yes I agree. apologies, I forgot to mention the headlight switch was original too, and it was reeealy crusty. had high resistance throughout the internal contacts....as we all know, resistance creates heat.....I installed a new switch the same time I fixed the connector.

All good.

The stock wiring is marginal at best, voltage drop is pretty big factory in performance.

That gif in your sig makes me laugh. My ex-gf would do something similar. LOL