Honda-SOHC

Sadly not. The bike had been sat outside for 10 years and the majority of parts were not salvageable. None of the original wiring or electrical components remain.

It has been a fair old challenge and this (I hope) is the last hurdle.

Here is a picture.

Hi Alan
Based on this diagram (and my manual) I have wired the R/R correctly. But with the ignition on there is no voltage going to the field coil via the white wire. The only way I am able to send voltage to the field coil through the R/R is to switch the white and black regulator wires.

If I do this I assume I will be bypassing the regulator and will cook the batttery!

I think the R/R is faulty... would you agree?

Thanks Al.

Could you please clarify that with the ignition on (only) the white Regulator wire leading to the Field coil should be reading 12+v and that the green Field coil wire is sent directly to ground?  Y/N


Thank you.

Hello,
I am hoping someone can help please…
Bike is a CB750 F1 SOHC 1977
Following a 2 year restoration, I finally took the bike out for a first test. Largely all went well, apart from the distinct lack of charge to the battery.
Checking the stator wires with the bike running at varying rpms (2000- 4000) showed 0 Ac voltage across all three.
Stator resistance is consistent 0.8ohms with no continuity to ground
Field coil resistance is 7.2ohms with no continuity to ground.
The replacement solid state R/R gave correct results on the diode test.
I believe the issue is the field coil is not receiving 12+v from the R/R. As I understand it, with the ignition on the Regulator should supply 12+vdc to the field coil which will then magnetise. This is clearly not happening.
Could someone please confirm my wiring is correct?
  [ Guests cannot view attachments ]
3 Yellow R/R wires to 3 Yellow Stator wires
Green = direct to ground
Red to Battery +
Black to ignition
White to White Field coil wire (being 12+v supply)
The green wire from Field Coil is direct to ground.
With everything connected and ignition on, I expected to see 12+vdc at the white field coil wire, but I am currently seeing 0v. What has gone wrong?
The wiring guide from the R/R manufacturer is:
RED: Positive      YELLOW: Phase input from stator      WHITE: Field Output for Alt.
GREEN: Ground      BLACK: Original sense input for Regulator
Any help greatly appreciated!
James