2. Why are there horn wires on both sides of the engine harness? I'm thinking it so you can put the horn on either side, correct me if I'm wrong.
Semi-correct. Some EB's actually came with high/low horns from the factory. I don't know if they always were on both sides of the rig, or were ever both on the same side though.
Otherwise, it's as you say and you can use either side you prefer. I just hooked up two aftermarket horns on a Bronco and used one on each side.
3. The rear lights seem pretty straight forward, I'd just like some advice on where to cut and connect the plug. It seems like doing it up in the cavity close to where it splits to marker/tail light would be the best since it would be shielded from the elements there. We spliced and wired everything up this morning, but I have a follow-up question. The ground strap that comes off the housing side of the connector, where does it go? Does it get bolted to the housing itself?
I know you said you got this already, but yeah, the logical place for the main connector is there inside the housing, and that's where I put the grounds too. Just a sheet metal screw into a hole, or a self-tapping screw makes quick work of it.
Pretty sure though that the ground is for the backup lamps AND the others as well.
5. The rear portion of the harness is quite a bit longer than needed. Did you cut and re-solder or just tie it up?
Don't know why the newer ones are so long, but I've simply tried to wad it all up without cutting. Should be more reliable in the long-run that way.
Frankly though, the last one I did was so long that I'm still considering cutting it up and splicing it back together. There's just only so many feet of wire you can hide like that!
All in all, I'd say that the main rear harness had about 3 feet too much wire and the Pink fuel tank sender wires are probably 6 feet too long! I know there are gas tank options to take into account, including some on the passenger side, but I still don't think that 6 feet is needed.
Do what you think best here.
Sounds like progress!!!
Paul