The dimmer switch lives in a wet, dirty, hostile environment under the floorboard, and carries the full current needed to run the headlights. A new switch and a set of relays out on the radiator support close to the headlights makes a lot of sense. Then all the dimmer switch has to do is carry the small current needed to turn the relays on. That also protects the headlight switch from heavy current, and you get brighter headlights to boot!
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!