SOHC.co.uk Forums > CB500/550
Testing Alternator etc
ozzybud:
First check that the field coil is getting energized with the key on engine off. Take the left honda nameplate off.
With the key on the three screws should become magnetic. Check with any steel object. The fiels coil is fed by 3 yellow wires #6 in diagram.
Bryanj:
There is also a bulletin on the 3 phase charging circuit operation in either Ashs dropbox or Alladins cave.
I would say 95% of charging problems are bad connections
BigAl (Alan):
Completely agree Bryan, normally poor dirty connections will cause voltage problems.
Another factor that is now starting to happen on these old bikes (50+ years) is the copper winding insulation (stator & field coils) are starting to degrade and fail. Most Kawasaki stators that I have refurbished in the past have failed a high voltage test to the frame, not because of electrical use, the insulation material is becoming less soft and flexible.
deltarider:
--- Quote from: Bryanj on February 04, 2025, 05:28:30 PM ---[...]
I would say 95% of charging problems are bad connections
--- End quote ---
So... also check for chafed wires.
Mike_Berkshire:
Thanks for all the pointers. I will do some investigating at the weekend.
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