I am looking at rectifiers on line for my 1979 kz650b3 and I have a few questions. They range in price from $35 to $150 and I am wondering if the expensive ones are much better or are they simply overpriced. Secondly, all of the units I find have 4 leads, 2 yellow and a black to the plug and a red with a pin connector. My regulator has 5 leads, the 5th lead is a brown lead with a pin connector. If these regulators on line are true replacements, what am I supposed to do with the brown lead?
I replaced my original rectifier and regulator with a modern combo unit from this guy about 6 years ago for around a hundred bucks "I think" it was pretty much a plug and play,
Works great and opened up a nice spot for a modern (blade style) fuse box.
The best 3 phase R/R's are SERIES type, which help protect your stator from cooking itself. Shindengen SH775 is the denotation, and they can be had for about $50 from ebay (used.) Don't buy from ebay unless SH775 is printed on the top fin. There are lots of fakes around. Triumph sells an adapter harness for about $10. Going this way is a little more fussy than buying a $100+ plug and play unit, but those are shunt type and inferior, so it's worth the slight extra work.
eBay item number:
To get the ebay link, hit quote when replying to my post, and you will see the link. The forum software knocks down ebay links these days for some reason.
Looked on eBay, but I still don’t see any rectifiers with the fifth brown lead. That lead brings power to quite a few components, like the horn and others. What do I do with the missing brown lead?
Can a 3 phase R/R be used on a 1 phase charging system? If not, my apologies to the OP.
Edit: an internet search suggests that a 3 phase R/R will work with a 1 phase generator, but it's not ideal. Something about the total number of diodes doing the work and the system stress will be higher in the R/R than using a proper 1 phase R/R.