I was just looking through LMC Trucks new Ford SUV book I got to cover my 01 Excursion. I found they sell a headlight heavy duty wiring kit that adds 2 relays, 1 for high beam and 1 for low. This is a very good idea for anyone that is having any kind of headlight trouble, especially if its switch trouble. I have been adding the relays on my own for years without a kit but if you have never done it the kit would take the guess work away.
So from a kit or from your head it's a great mod for almost any vehicle and a great mod if you run bigger bulbs or have switch burning problems.
So I wanted to spared the word a bit, headlight relays are a very good mod for almost anyone. It's such a good and simple mod that everyone should at least know about it