I’ve been helping my mate with his vintage CB750 Honda that wasn’t charging. He’d bought a couple of spare old voltage regulators on ebay but all had the same fault, no charge. Now you can easily open these up and they are fully adjustable, we gave it a try but had hit and miss results. What Dave wanted was a nice steady 14v
Fitting an adjustable BMW style voltage regulator on vintage Honda 4’s
- Thread starter ebbo
- Start date
So he bought an adjustable regulator meant mostly for BMW’s and he wired that in. It works perfectly and the voltage was adjusted to spot on 14v
The important bit of info is what wires go where on the adjustable regulator because the Honda and BMW wiring diagrams don’t compare at all well.
Honda wire colours on a BMW style adjustable voltage regulator
The important bit of info is what wires go where on the adjustable regulator because the Honda and BMW wiring diagrams don’t compare at all well.
Honda wire colours on a BMW style adjustable voltage regulator
Attachments
Cook1e
Registered user
Would this be of any help?
https://www.electrexworld.co.uk/acatalog/RR24_-_Regulator_Rectifier_CB750F1_CB750K1-K7_CB750KZ.html
https://www.electrexworld.co.uk/acatalog/RR24_-_Regulator_Rectifier_CB750F1_CB750K1-K7_CB750KZ.html
His 500/4 does have that fitted but the 750a (automatic) we were looking at has a high output alternator, He didn’t think the combined rectifier/regulator would work too well with the high output.
Anyway, the idea was to put the info out there for anyone’s use, cheers
