Seems to me you are using aftermarket components for something they weren't designed for and that's where your problem lies. The brown wire is the sensing wire that "triggers" the regulator into charging the battery whereas the SH775 doesn't have one and just meters the current going to the battery as the load changes. The Dyna takes a lot of power coupled with lighting taxes an already weak charging system. Back in the day I was running a Marshal 55w quartz.low beam and a 100w pencil beam that worked great out here but it taxed the rectifier to the point it melted the solder joints on the diodes. I replaced it with a GS 650 unit that is much larger than the stock one but little did I know it was taking it's toll on the wiring, regulator and battery. As the wiring overheated the resistance multiplied leaving less power going to the battery. The tip off was melted insulators and connectors. I wound up getting a sealed beam halogen headlight 35/55w and added a aftermarket regulator for just the battery and one for the lights. It kinda worked until I parked the bike in 98 until 2013 when I got it running again. I had bought a used Z1 regulator but it didn't work any better than what I already had. I bought a later model R/R from the Old Kaw Man but I was back to a weak charging system and slowly draining battery. I went through three stators and a Caltric R/R (Made in CHINA)
that fried my last stator. That's when I took Ed's advice and tried a used SH775 R/R and bought a used OEM stator. After making sure there wasn't any shorts in the stator I hooked it all up and now I have a working charging system but it could be better. Next will be a Rick's rotor and I should be able to run all the lights I want while still having my starter and accessories I use all the time.
Wouldn't disagree with any of what you say Steve, however in this case until the "resistance fault" fault is resolved causing a volt drop on the white output wire, whatever parts you fit aren't going to work correctly. In my experience you need to "box off" the basics first. I know I keep saying it but corrosion related resistance is the curse of these old bikes.
1982 KZ1000 Ltd
The following user(s) said Thank You: SWest, sleazy_rider