You've been very helpful, thanks. You gave me an idea.
I started out repairing and replacing body and fender parts as well as a few items like a radio. It seems as though today's car parts often snap or twist together, that manufacturers avoid screws, nuts, and bolts whenever possible. In other words, everything is a special trick. So I learned how to fix things either by watching a You Tube or by going down to the Upull yard first and practising and figuring things out.
Granted those Rangers don't have batteries, but maybe I can do something similar for electrical additions and repairs, using a continuity tester first on mine, then going to the boneyard and figured out how/where to hack away.
Electrics will become highly relevant this spring. I will be swapping out those old 60/40 seats with a set of nice leather buckets that came with electrictronic seat controls.