There was a Caddy towbar in my lock-up for years. I cannot even remember where I got it from, but I guess I must have spotted it for sale locally and thought I might as well get it ‘just in case’. After I retrieved it from the lock-up it did sterling service as a doorstop for my workshop for another couple of years, before I figured I may as well fit it to my Caddy. When I removed the NSR access panel inside the load area, I found evidence that it had previously had a towbar fitted, but sadly that evidence was in the form of Scotchlok connectors still attached to the wiring harness. The previous owner had compounded the mess by attaching cables to feed his high level brake light (see post #1). This had to go. After I had prised the dreaded Scotchloks off the cables, I was able to remove the pins one at a time from the 8-way connector and slip some heatshrink over them to repair the damage to the cable insulation. With the pins then replaced I wrapped the loom in coroplast tape. I got quite a bit of the white overspray off the connectors whilst I was there. Now the standard wiring was looking more like it should, and it was ready to have the towing connector wiring added. The approach I decided to take was to make up a splitter loom to connect between this plug and socket, with another branch going to the towing connector. I suspect this may have been how it was done if the towbar was fitted as a factory option, judging by the blanking grommet I found adjacent to where the standard wiring goes through to the NSR light unit. It was only once I had made up this additional loom and connected it for testing that I realised the OSR light unit must have been from a LHD car, as it had a reversing light rather than foglight lens. This gave me the idea of wiring this as a reversing light, and adding a foglight below the bumper. The wiring for this was achieved by using the wire already in place across the rear for the OS reversing light, and running cables from the towing connector to the new foglight. Once I had confirmed that everything was working OK with the splitter loom connected, I removed it to wrap it. When it was then re-fitted, a problem revealed itself, with the offside tail light no longer working. Even with the original wiring configuration restored and the splitter loom out of circuit, the tail light stubbornly refused to illuminate. When I unplugged the relevant light unit, I could measure 12v at the plug, but this disappeared as soon as a load (bulb, even LED) was connected. All the signs said I had a high impedance connection somewhere. This was traced to between the fusebox and the 8-pin connector behind the NSR access panel. Immediately I decided this was most likely to be where the Scotchlok had previously been attached. Maybe the Scotchlok blade had cut through part of the cable core. I cut out the offending section of cable and checked the impedance from the cut end back to the fusebox, which was fine. I took that to mean that I had identified the cause I soldered in a new length of wire where the Scotchlok had been located, but it made no difference. This was a nasty surprise, but then it probably was not the smartest thinking anyway. To preserve the cable colour code at the 8-pin connector I had replaced the damaged section of cable but retained the original terminal pin. There was no visible sign of damage or corrosion to the connector, but now I did what I should have done in the first place, and replaced the whole section including the terminal. Finally it was solved and I was able to refit the rear light units and bumper.