The Clustertruck continues to fight tooth and nail, in open rebellion of any and all attempts to resuscitate it. Progress, as usual, has been slow, and for every box I check, 2 more boxes get added.
The good news - I believe the alternator is wired in. Thanks to Pin_Head and Bj40Green over in my "School Me in Wiring" thread, I was able to located a switched ignition source in the engine bay (the old voltage regulator terminal).
Unfortunately the terminal was too dirty/corroded to get any voltage out of, and I wound up breaking it in my efforts to clean it. Ultimately, I opted to cut the wire behind the connector and ad a spade terminal:
I backed it up with zip ties (to prevent flex/fatigue at the connection) and then heat-shrieked the bundle. This connection will be taped, later, to further keep crud and water out.
After moving the truck one step further from "stock" and further mangling the harness, I moved on to replace the grounds. I spent about 20 minutes fighting the foot of my batter tray to get it lined up with its bolt hole in the frame. Then I spent 20 more minutes trying to mate both the battery-frame lug and frame-block lug to mount here. Turns out the bolt is too short, so I'll need to find a longer one. I opted to just install the battery to frame ground, for now.
At this point, the charging system is wired in. Fresh dreadlocks off the battery:
Big Red cable - to stater
Grey-to-red: voltage sensing wire from alternator (with fusible link)
Yellow: fusible link to main harness
Blue: fusible link to alternator BAT cable.
The alternator side:
Yellow - "lamp" or "field" wire. Run to switched ignition at the old voltage regulator connection.
The black taped section is a diode to emulate the resistance of a "charge warning" lamp. This is required for proper operation of the alternator.
Big red - 8AWG to battery through 12AWG fusible link
Thin red: "sense" wire to battery, 16AWG with a 20AWG fusible link at battery
Big black wire - ground from alternator to tub.
There's still quite a lot of clean-up to do.
1. Longer bolt at battery tray to allow for engine block ground
2. Tape/isolate old blue/white main harness wire (bypassed by new alternator - too much amperage for stock harness).
3. Tape/seal prior voltage regulator splice under dash by PO.
4. Heat shrink and tape misc. connections and clean up/retape harness
5. I should really find a more permanent horn solution.