Typical electrical "fixes" from some previous owner resemble this:
As near as I can tell, that green wire is being held into the connector by gravity. No, I'm not kidding. I lifted up gently on the wire and it came off in my hand.
After fixing a few of these in the dash, I decided to try to figure out why the high beams weren't working.
Uh....
This whole driver's side electrical plug dealie on the fender had melted. Nothing was making any kind of connection, and live wires were just sort of dangling there. But how did the low beams still work on this side? Answer: the "master electrician" had skillfully jumped one headlight to the other via (ready?) a speaker wire jammed into the connector at the headlight, making sure to pinch the wire nicely in the headlight trim ring, and use one not one, not two, but three pieces of wire all connected with (yup) wire nuts.
The side marker light was done in much the same fashion. And the turn signal...didn't work at all.
After ripping out this mess, reterminating and re-wiring the entire driver's side of the car, all the lights that flash on the car flash when commanded to, and all the lights that aren't supposed to flash burn steadily upon command. Success!
So, I put the grille back on.
It's looking like a car again. Even better, it looks like a JAGUAR again!