That is the 'toadifying' of the rear lights. You will recall I was concerned about the Jeep's brake lights overriding the turn signal sent by the coach. Here is my solution to the problem which has been proved to work.
The kit I used was a RadioShack DPDT relay ( Part No. 275-0206 , less than $3 ), two of the diodes I had got from the Demco kit, a one gang electrical box with lid and a collection of crimp on connectors and wire. The relay is actuated by the 12v feed from the rig and changes over the feed to the brake light lamps from Jeep to rig when towing. The CHML is not inhibited by the relay.
Attached is a series of photos which show the sequence of work. The relay is first wired up and placed in the elec. box. The pairs of wires exiting the sides of the box will lead to the brake/turn lights in the tail lamps. The 4-wire set plus the red 12v enter the box at the end. Next into the box are the two pre-wired diodes ( sharing the common brown running light feed from the rig ) Again, another two pairs exit the side of the box to lead off to the running lights in the tail lamps.
After the 4-wire looms are brought into the area by the 'basket' in the trunk and connected up, the whole kit and caboodle is tucked away and the basket put in place.
I refer you to the excellent description by isodoles of the connections behind the tail lamps and I thank him again for giving me the color codes for the specific wires.
One comment I should make - I could not find a way of fishing the loom straight down to the basket area. That route is stuffed full of foam insulation. In the end, I ran it down outside that panel and through one element of the air vent down there. I used the same entry for the loom coming down and across from the right hand tail lamp.
After all that, I connected a temporary 6 wire socket to the wires at the front and hooked up to the rig. Everything worked fine and, most importantly, operating the Jeep's brake did not override the turn signal coming from the rig.
Here's hoping the photos get uploaded and in the right sequence.
Sent from my iPhone using JeepGarage