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No, I would locate the problem and fix it and replace any wires that have degraded insulation. No need to replace good parts.

It sounds to me that bad things have happened inside the headlight bucket(s). Lots of wires stuffed in there.

The headlight ground wires can have worn off insulation and it won't cause a short.

OK I am not following you exactly, but that does not matter, you need to do a visual inspection of the harness, just poking around with the ohm meter will just tell you what you already know, is that somewhere the hot wire is rubbing against the chassis.

Any wiring that is frayed or has crumbling insulation needs to be replaced. Erik's Surplus has everything you need.

The clicking is the self resetting circuit breaker inside the light switch keeping your truck from catching fire. You still have a dead short to ground somewhere in the headlight wiring. It could be the dimmer switch, it could be inside the buckets, who knows until you start looking for it.