SOHC.co.uk Forums > CB500/550
550F charge issue?
Davelu88:
Many thanks
McCabe-Thiele (Ted):
Personally I would start by charging the battery fully with a charger then see what the volt readings are after standing overnight Then I would see what the readings are with the engine running. Could be you have already done this. When I've ruled out the battery then as has been said I would check earth's etc & charging voltage. I use an old fashioned clip on induction gauge on the battery earth strap to then check current flows.
Davelu88:
Thanks Ted , Battery is on charge so will see what happens but same Battery on other bike showed charging when revved . I asked Mick the previous owner and he said he checked it when rebuilding it and it was putting out 14v so obviously something amiss . Electrics are like magic to me so not overly confident with this 😒
deltarider:
--- Quote from: McCabe-Thiele (Ted) on February 27, 2023, 09:00:07 PM ---Personally I would start by charging the battery fully with a charger then see what the volt readings are after standing overnight Then I would see what the readings are with the engine running. Could be you have already done this. When I've ruled out the battery then as has been said I would check earth's etc & charging voltage. [...]
--- End quote ---
This ^. After a night at rest the battery, not connected, should read 12,6 V or more. When less, battery is nearing its end.
Start engine with fully charged battery. Switch on the headlight. Rev the engine from idle to say 3500 rpm, whilst holding your left hand in front of the headlamp and check if the light's intensity increases. When it does, there is charging. These are basic tests. Toying with the multimeter comes later... maybe.
K2-K6:
Regardless of battery float level, it should be showing decent increase in charge volts when running and revs increased.
Going from 11.45 to 11.49 when revved shows there's negligible power coming from alternator to battery, for whatever reason that may be.
That's the problem to investigate. Basic connection check first, wires from alternator, everything around regulator rectifier to ensure no simple disconnect is present is initially a good place to start.
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