SOHC.co.uk Forums > CB750

Field Coil/Charging problem...

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AshimotoK0:

--- Quote from: JimJam on March 28, 2018, 09:13:22 AM ---Cheers Ash,

Yes, good idea on the direct feed. will give that a go.

I checked each of the stator wires for continuity to ground against the Alt. engine case.  There was no continuity. Is that sufficient?

--- End quote ---

Yes that's correct .. Back in the day two of my 400/4's broke down insulation between the copper wire and the mag-frame (and hence I got continuity) . I don't think this is a problem on the 750 though as the stator runs in oil.

BigAl (Alan):
Hi James,

Simplified wiring diagram (as image) which may help. PM me if the image is too small to read

Alan

JimJam:
Thanks Alan.

I put a direct 12v feed to the Field coil and it magnetised. So that's a good start (Thanks Ash)

I think the BLACK regulator wire should feed the Field coil rather than the WHITE. Contrary to the instructions. I will have a look tonight..

Many thanks both for help thus far.

BigAl (Alan):
Hi James,

It can be a bit confusing as to why Honda selected these colours (as image) The original regulator has a BLACK + input and a WHITE+ switched output.
The 7 wire sub-harness (part#31110-300-154) that connects to the alternator/coil will have a white wire, a black wire is not present within the sub-loom

Alan

JimJam:
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?

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