SOHC.co.uk Forums > CB350/400

Charging

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hondatri:
Me again guys have not got near clutch yet now I have found another problem. I went on a charity run a few months ago we were advised to ride with headlights on after 28 miles my Battery was dead I Charged it up and it seemed ok until I put headlight on. I took battery out yesterday and found that water level was near bottom I topped it up with distilled water and charged it up. I left it disconnected overnight and this am voltage was 12.3v I went for a run of 15 miles and when I got back Batt was 11.94. I connected an ammeter in series with Pos lead and got following Readings. Idle 0A  2K=2A  3K=4A and 4K= 6A. When Headlight put on Charge was 0A at all revs. Reconnected Battery and got following Voltages. Idle=11.64, 2K=12.08, 3K=12.50 4K=12.80. With head light on the voltage never went over 11.75V. I have a Haynes Manual and am going to check Alternator out put I had a look at voltage reg. and cleaned contacts it is the non adjustable one. Has anyone got any ideas as to what I should look out for.Should I get a new Battery first.

Bryanj:
Corroded connectors or grounds are the favourate there , also voltage drop on the black lead at the regulator

hondatri:
Thanks Bryanj I had Reg off to see if it was adjustable and I cleaned th three connectors and put some WD40 on them. I will chase up circuit and do the same with all connectors. Do you know where the Main Earth point is and do you think I should replace Battery due to going low on water and refilling.

Lobo:
...found these pages from a '400 manual if it helps...

Slightly confused, as the battery sounds like its being overcharged ('water' disappearing)... and yet from your description its definitely being undercharged (voltage should be around the 15v area during running)

Given that you're not achieving 15v, and assuming all connections / loom good... then I'd suspect the Voltage regulator. Hopefully the attached pages / your Haynes will confirm or otherwise.

Has the bike been 'upgraded' with respect to lights? I think the original head was a 50/35W lamp.

If there is any doubt as to the age / condition of your battery then, yes, perhaps you should change it.

hondatri:
I appreciate that info. Does anyone know what the AC voltage from alternator should be. Thanks Again. I am going for a new Battery first.

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