It's a 79 ranchero gt so it's got all the gauges, of course mine are lay'n on the floorboard in a pile.What year is the Ranchero?
There are outfits out there that make replacements for a lot of that OEM stuff that turns to powder.
The alternator swap on Brand X was pretty much drama free until stupidity took hold. A goofy thread for the bracket and the other bracket needed a shave to fit the adjusting bolt, no biggie, did a preliminary wire up and worked GREAT!! Bright headlights, you can actually see the brake lights!
Charging 7.5 volts and only dropped half a volt with everything on, at an idle, outstanding! Plotted the wire route, the lead wire was yellow, really, THAT was not gonna work, wrapped it just like the factory did only better tape, fired it up and all's good. Yup, shut it down and massive discharge.....WTF?
Restart, everything is good, shut it down, discharge, I'm looking atound, going through the wiring, back over the directions, both very short paragraphs. I can't find a solution, ok, I'll start pulling fuses, there is like 4,
Grab a couple tools, and the multimeter turn to walk towards the truck and the FUC'N HEADLIGHTS ARE ON!!!!!!!