SOHC.co.uk Forums > CB350/400

400/4 Battery not charging

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THUNDERDOWNUNDER:
Ideas needed for fix . At the moment I have to charge my battery off the bike . Fully Charged it lasts about Half an hour . Starts on the button then looses power fast no starter and indicators stop . If I fully charge and leave it over night it drains . So what’s wrong Guys ?

Bryanj:
Most likely is corroded connectors then regulator then rectifier.
You need a decent multimeter and a methodical approch to sort out electrical problems

SteveD CB500K0:
Good place to start:

Place voltmeter on battery terminals and start engine. Run up to 4000 revs.

What voltage do you see?

THUNDERDOWNUNDER:
At 4000 rpm it’s readin 12.41.  At tic over it’s 12.34  .

Johnwebley:
How old is the battery?
Get it load tested

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