SOHC.co.uk Forums > CB350/400

Electrical charging question.

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Alexrayz:
Hey man I had a similar issue with my bike, wouldn't charge, or at least the charging voltage was super low.
In my case it was one of the alternator coils that fried. The regulator was fed with two phases instead of three. As a result the rectified voltage was about the same as what you have.

Normally, at 3500 rpm, you should get 14V max. 12.5V means it is not charging.

I didn't do anything to find that out, my mechanic did this time, so can't really help ya with the research process.

Good hunting and looking forward to read your findings.

Cheers, ride safe!

ComfySofa:
Hi there - its been a while since ive had the chance to get back to the Honda to test it...ive started with testing the stator resistiance and im getting about 0.7 across the 3 yellow wires....is that a bit high?

Edit: Just opened the Haynes manual and found it should be 0.61 to 0.69 - not sure how critical that number is?

McCabe-Thiele (Ted):
IMHO I would not worry about 0.01 Ohm taking into consideration the accuracy of your meter plus the connection you used.

Also worth cleaning up the contacts in the connector block by method of your choice.

ComfySofa:
Cheers - thanks for that. Well, its a whole new electrical system - the Reg/Rec is specifically for Lithium batteries. Ill make a start on cleaning and checking connections....as i say it seems to be steady at 12.6/7 volts....

Sesman:
Agree with Ted. Did you null your connection cables? I’d say you are mighty fine for coil resistance value. The charging voltage is a problem though..obviously.

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