Guys, you are going to LOVE this. John, you were correct. While it really, REALLY looks like this car has 2 reverse lights, it doesn't. The one on the right is the fog lamp.
I never had the 2 on at the same time during my testing, mainly because I was satisfied that the fog lamp was fine. Unfortunately, I found out the hard way. Delighted with myself for managing to splice, solder, earth a couple of cables, all seemed well when I tested with the voltage tester. So I wired it all up and then noticed that the ''reverse light'' on the right hand side was shining bright red.
FOG LAMP ALERT!!!!
So, in actual fact, I had no need to do anything. The fog light and reverse light were both working perfectly before I messed with it!!! The earth voltage test produced nothing from that side, because I didn't have the fog light switched on.
Anyway, to make a long story even more boring, I tried reversing the process and now my fog light doesn't work!!!! I guess I may have blown the fuse somewhere along the way???
After the embarrassment passed, I decided that the only way to redeem myself for my own stupidity, was to go out and fix the brake light/heated window issue. Thankfully after 5 minutes of making sure the earths to the heated window and the window mounted brake light were secure, that issue was solved. I guess one of them was loose? So I felt a little better then.
Now, I guess I have to replace the fuse for the fog light. At this stage though the harness plug is almost unusable. How can I get the 2 metal clamps in the harness plug open so that I can take out the old wiring old worn wiring, and clamp in the freshly prepared fog lamp wires? IS there an easy way to do this?