Hello, I have a 1997 rv with a ford chassis. The headlight switch gets really hot and light won’t cone on and signal or horn will work. I have already replaced the switch but still same results. What do you suggest. ?

wiring has a problem somewhere with too much amperage being used. Get out a ohm meter and start testing the wiring and the devices it powers

Will putting in a relay in the headlight switch wiring take care of this problem ?