Most cars used to use them. Now they tend to just route all the power through the light switch. My 1996 Audi A4 was my first car without headlight relays. After the switch ($300 multifunction switch) got fried twice, I installed relays and no more problems. I don't know if the Renegade has headlight relays. Someone mentioned recently he would check, but he never did.Possibly a headlight relay? Most cars use them.