SOHC.co.uk Forums > CB750

Overcharging

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TIM1954:
When I rev my cb750 k2 it goes up to 17.5 volts when checking with a multimeter across the battery. Does this mean the regulator is faulty?

Bryanj:
Is it original or electronic replacement? Could just be a bad connection to reg

TIM1954:
Original stator, regulator and rectifier that has done 11500 miles.

taysidedragon:
The original regulators are adjustable.  I would look at that first.

Bryanj:
They are BUT before playing with it check the voltage on the black wire at the reg to earth, it should be same as battery votage(check with ign ON but kill switch OFF) if its low you will get an overcharge as the reg thinks the battery is low.

If the volts are ok it is possible that the moving contact inside the reg is stuck in one position, carefully remove the reg cover and check contacts.

In Ashs dropbox is an explanation of how the 3 phase charging works

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