Unusual CLICK sound near headlight switch

Lately I've noticed a fairly loud click sound in the vicinity of the headlight switch while driving. To me it sounds like a breaker popping but there is no breaker. The lights still work fine. Do fuses
get "tired" sometimes and make noise? Any ideas ? Thanks.

it's probably the relay clicking on. nothing to worry about.

I would find the source, an electrical click/-pop isn't something to ignore.

Maybe you have a resident click beetle (family Elateridae) that has taken up residence.

Hey, it could happen!

Oh look, the nice lady is bringing me my pills.

Lane-put on your reading glasses and check to see if those "pills" have little tiny legs...
here, you might need a little better sun-light: http://obs.astro.ucla.edu/towercam.htm

I'm with Alan on investigating. It could be an electrical arc jumping which could cause a fire or burn up the wiring. Old copper wire and copper open to air turns greens and looses it capacity to carry current - the push on terminals and even the screw connectors can become loose and arch too. (Many houses with the short used aluminum wire burnt down due to this arcing). Make sure headlight wire off the relay to lights and from battery to the relay is heavy enough - especially if you have high wattage bulbs (like H4 upgrade). I'd check too to ensure you actually have a relay for the headlights - a switch usually can't handle that much load and will start arcing as it gets worn --- and finally quits or catchs fire.

Could it be coming from the speedometer? Lots of moving parts in there and maybe something that is binding or going bad. Does it happen often enough to reach up behind the dash so you could possibly feel where it is actually coming from?

Might just be the speedo cable loose and binding at the speedometer connection...best to check everythng.