The newer factory wired rigs (Fords for ex)usually have the relays under the hood. If you are not running a trailer that has a bunch of running lights you should be fine. If you are running a full set of running lights and double tail lights I would go with a relay to ease the strain on the head light switch. The factory trailer harness on my 78 did not have relays. If you are running a Chryco FSJ, you are on your own as I do not know what evilness was done there
65 wag. with a bunch of stuff done and more happening.<br /><br />\"If the local junkyard calls you for Jeep parts, you might be a redneck\".... and yes they do!