SOHC.co.uk Forums > CB500/550

Testing Alternator etc

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Mike_Berkshire:
Hi all, can anyone point me in the direction of a testing approach for CB550 charging circuit. I have tested for voltage across the battery when the bike is running at about 3,500 rpm and Im getting just a smidge over 12 volts which is presumably the standing voltage across the battery. I have replaced the rectifier but not regulator; everything else is as I got the bike. I have had a trawl through hints and tips and the only thing I can find is a link which now leads to a game download site as opposed to a testing regime. Cheers, Mike

Sesman:
Mike.

Have you tried the CB550 manual in alladins cave?

Sesman:
Page 93 to 97. Start with the rectifier input and output voltages, remembering that the input is AC and output is DC . For the ‘input’ check between each phase and phase to earth.

My money is on a failed rectifier🤞

Mike_Berkshire:
Thanks - ill give that a go

Sesman:
Page 97 shows the ‘static, off the bike method’ of testing the rectifier.

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