I've had experiences wear one short causes another. This happens when the first wire heats up inside a wire harness and melts the insulation of adjacent wires causing additional shorts. More than once, have I found myself scratching my head why I have a short on something I have not activated or used. Only to discover later, the cause of the secondary shorts was a prior primary one. In some cases, the primary short can be several feet away from the secondary damage.
If the wires are cooked in your headlights, but you weren't using them at the time, then you may have more than one short to contend with.
I once made repairs to a car, tested the repair, and then the car sat for a few weeks before I came back and worked a second repair. During the second repair, I discovered a short. Later, after everything is sorted out and repaired, I see the short started with my first repair wherein the car only ran for 30 seconds before I shut it off. Long enough to melt insulation and cause secondary shorts, but not long enough to smell anything burning.
Best thing to do is undo what you did.
@Challenger RTA nails it.
I recommend you begin by rewinding history. When was the car working in a way without any shorts what so ever? Then, what has changed or repaired since that time?
You may need to go back and recheck those repairs for faults causing shorts. If you're lucky, only one engine compartment wire harness is impacted.
Once resolved, and you're ready to hide the damage, with some effort you can repair the harnesses yourself with any color wire, and hide the wrong colors when wrapping the harness back up in vinyl tape. You will want to keep as much of the correct color wiring that still shows at the ends of the harnesses.
Alternately, you can buy reproduction wiring harnesses and replace those damaged. But, you will want to ensure the cause of the short(s) is resolved before risking a new harness.
Shorts and wiring problems can be a real PITA because they can be hidden and hard to locate. Once a harness is damaged with melted insulation, don't be afraid to unwrap the whole harness to expose any secondary shorts. Fix things first, make it look pretty, later.
If you don't have a soldering iron, go treat yourself to some decent tools. If you don't know how to solder, it's easy to learn by watching some youtube videos. For this kind of work, I would used a nice Weller soldering iron, assorted shrink tubing and a decent heat gun. I mention this last point, because I recommend your repairs all be soldered. Twisting copper together and covering with sticky electrical tape is fine while troubleshooting. But I recommend your final repairs be soldered connections and covered with shrink tubing.
