Halogens are hard on the switch no doubt. All I'm saying is a new switch will run a long time without problems. My 73 Ranchero did not come with halogens. I got the car in 1989 put in halogens in about 1994. In 1995 the switch went out, probably due to old age and the added load of the halogens. I put in a new switch in 1995 and it's been fine ever since. That's 12 years and about 75,000 miles later. As I stated I put in a new switch in my 66 a month ago (halogen equipped) and all is well. If I start having problems I also will add the relay, but I don't think it will happen. Even if you do the relays the switch should be changed anyway. I would not mess with the used one you have because a new one is cheap and readily available. BTW. Changing the switch is about a 3 minute job.