A few melted spots in headlight harness

I added relays when I installed thees light fixtures. The higher current would only make matters worse in event of short circuit. Headlight switch has a cycling circuit breaker inside rated at 15 or 20 amps, protecting entire circuit from switch to bulbs. It should prevent catastrophic meltdown. Relays render it useless if the fault lies beyond the relays. Locate the fault first. good luck