SOHC.co.uk Forums > CB350/400

Charging circuit test

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stevush:
Hi,
Have had a problem with my 400/4 regarding charging. It seems to be charging OK during normal riding, starts first time on the button even after leaving it for 1/2 weeks but if I ride with headlights on for say 10/15 miles it discharges the battery and next time I try to start with the button, the battery won't turn the starter but it will kick first time.  I've just fitted a new fully charged battery and I've connected a multimeter across the battery when running at 3/4000 rpm and I'm getting 12.02.  I've cleaned the points on the voltage regulator, swapped it with another 2 regulators but I can seem to get a higher reading.  I suspect the alternator is not working correctly, any further tests to prove this ?

Thanks
Steve

paul G:
Should be much higher than that around 13.8v if I remenber correctly.
I have a load of info somewhere I will see if I can find it.

TrickyMicky:
Hiya,
    Had similar problem about 18 months ago, did not possess means or know-how to check if it was alternator, rectifier, or voltage control unit. I'm afraid I took the easy option and replaced the rectifier and control unit with a single "potted" item from Silver's. Managed to concoct a couple of mounting brackets, and placed it where the control unit originally sat, there is enough slack in the wires to the rectifier to pass them through the frame to the left hand side. So far no problems, charging well, original units removed and placed in the Black Museum.

stevush:
I have a few spares so maybe I'll swap the rectifier and see if it makes any difference. Looks like the alternator isn't difficult to swap either ?

Thanks
Steve

Bryanj:
Sounds like either one of the yellow wires has disconnected or one phase of rectifier shot, check for AC voltage on the three pairs of yellow wires that exit the engine into loom

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