SOHC.co.uk Forums > CB500/550

Was over charging now under. 16.7v to 12.2v

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totty:
Tested at the battery, are you certain that's not correct?
I've just read 4 online guides that also said test at the battery.

totty:
Just tested and the voltage between the red wire from the reg/rec to battery -tv was 12.21 the same as at the battery.
However what doesn't seem right is the voltage on the black wire was only 11.30v

mike the bike:
It should be the same as the battery voltage.  You need to check where the volt drop is, ie. A bad connection,  dodgy fuse holder etc.

Yoshi823:
Using your resistance meter, test across the red & black wire of the ignition switch. It sounds like the  internal contacts are corroded.

I had this on my CB125T2

totty:
I packed up before reading these posts, I'll test as suggested one evening through the week.

I cleaned several connections, the top plug of the three down the side of the electrics panel made a difference bringing the black wire up to 0.2v below battery, but surprisingly it didn't affect charging.

The ignition switch wiring could do with some work, externally the switch looks new, but the wires to it are a little corroded and covered in a different tape with a lump in it. It looks like a spliced in replacement but I haven't unpicked it yet. I could probably do with a replacement one if anyone's got a loom they're cutting up.

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