I emailed to a guy who was selling one on eBay . He says that black piece is just a block for the harness. Makes no sense, I’ll have to call M&H electric on Monday, I think they make them. I should be able to get reliable answers from them. http://www.wiringharness.com/
Lots of times, the guys selling this stuff on E bay don't know that much about what they are selling. In any case, this is the M&H kit, https://www.summitracing.com/parts/...MIwIis7LXz1gIVTAaGCh0hVw7uEAQYASABEgKPHfD_BwE I would think that block plugs in to the harness and connects the Blue and Brown wires. The M&H part number is 27555.
It has a bar for better words that connects the two wires discussed together. The other is an adapter from the old harness to new style plug. Nelson
Well I have one somewhere but cannot find it, I was going to see if I could open it up for you. The ebayer has no clue. Nelson
I took a picture of the one on my car. You can see the metal tabs and if it did not have a bridge it would not work. Nelson .
I ended up getting a true one wire alternator from an alternator and starter repair shop I found in town. One red wire to it. Nothing else. No splicing wires from the old external regulator. He also pointed out that my hot wire is too small, and I agree, and he will make me a new one. So much misinformation by surfing the Internet. These newer ones are “self exciting”, no need to rev the engine to get it charging. 80 something Amps. Progress.
Switched over to the one wire alternator. Idles at 13.95 volts now. That’s the good part...... Now I need to figure out why my headlights suddenly don’t work. Time to look at the wiring diagram. I know the previous owner cobbled some things, so time will tell.
After much confusion with those SI alternators vs. a true one wire alternator, I finally found a short article that explains the difference. If you want a really easy altternator, get the self exciting. It doesn’t need the other two wires. It’s a true one wire system. Done. https://www.americanautowire.com/where-do-i-put-the-3rd-wire-on-my-1-wire-alternator/