Mama Kaw went through many iterations of those old regulators due to overcharging. Some that bench test good will still overcharge because the early ones did that and, when the later iterations of the the old style regulators fail they almost always overcharge, sometimes massively enough to blow light bulbs & burn points to a crisp. Used ones will be a crap shoot. They're a little delicate too, as they tend to fry themselves if the battery isn't fully charged to begin with. They're really just battery maintainers that can't pass much current reliably.
On Z1's they were mounted in a hostile area behind the motor where cooling is a problem. One of the best things Mama Kaw did for the old regulators was to move them to the side, away from heated air coming off the rear of motor.
We're making the transition to the SH775's on our Z1's as we go through seasonal rotation beginning this year. A simple pigtail harness will make them plug n' play without butchering the OEM harness, making it simple to revert to original if desired.
Mikaw's wiring diagram/schematic above is the clearest one we've seen.
Good Ridin'
slmjim
A biker looks at your engine and chrome.
A Rider looks at your odometer and tags.
1973 ('72 builds) Z1 x2
1974 Z1-A x2
1975 Z1-B x2
1993 CB 750 Nighthawk x2
2009 ST1300A
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