Flat tow tailights

[1988YJ]

A few years ago I wired up the tailights in a YJ I had with some diodes to a connector on the front bumber so when I flat towed all I would have to do is plug in a cable from the MH to the YJ and the jeeps tailights worked. Supposedly the diodes blocked the current from backfeeding to the computer, etc. A friend asked me how I did it and I lost the wiring diagram I had. I think I just used 3 diodes from Radio Shack on the rear left-turn, right-turn and tail wires to the rear. Has anyone done this before? Do you have a copy of the wiring diagram? I thought I got it from here but couldn't find it in a search. I trying to remember... I'm thinking you cut the wire from the jeep, put in the blocking diode and splice the tailight wire and tow vehicle wire together... What's the polarity of the diodes? need a diagram.

[iroc-cj]

I went to my local RV dealerships parts dept, they sell diode kits with instructions to do this, I think it was about $20 for the kit. Radio shack diodes would be cheaper, but no diagram.

[1988YJ]

I figured it out. Three $.50 diodes and point the arrow towards the tail lights. Works great, about .4 volt drop. The brake, turnsignal and tail lights work fine. The only challenge was the screwy color code the TJ's use going towards the rear lights. Brn/Yel = tail, Grn/Red = left turn, Blk = Grd.

[Haole]

Originally Posted by 1988YJ

I figured it out. Three $.50 diodes and point the arrow towards the tail lights. Works great, about .4 volt drop. The brake, turnsignal and tail lights work fine. The only challenge was the screwy color code the TJ's use going towards the rear lights. Brn/Yel = tail, Grn/Red = left turn, Blk = Grd.

Yes, the arrow points to the taillights. A decent sharp probe on the voltmeter makes finding that easy.