Rewiring headlights to a toggle switch

I'd like to hear more info on why you are doing this. If you have an electrical problem with the stock wiring, probably a lot cheaper / easier to fix the real problem.

If you have a semi gutted/ custom interior/ dash, and non stock switches, different story.

The thing is, there are several circuits in the light switch. The headlights are supplied UNfused power directly from a big SPLICE in the under--dash harness, and the only circuit protection for the headlights is a circuit breaker on/ in the switch

The tail/ park circuit is actually a separate switch (in the same housing) supplied FUSED power on a separate line.