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Honda CB750K5 Restoration by Royhall

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K2-K6:
Think I'd firstly check with probe in each while connected and running to see what that gives you, then go from there.

royhall:
I will leave it all connected and try it at the rec/reg  plug to start with. What voltage should I be looking for, and I assume it will be AC on the yellow cables. Should one be dead until the lights are on?.

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K2-K6:
All three yellow are live and ac to measure. Can't find voltage spec to check this against.

Regulator controls output by switching a resistance into the white wire going to field coil if voltage is above target, to then drop output of all three yellow simultaneously.

There's really good description in original 750 workshop manual, section 8 if that's available on Ash's library roster. Worth a read through to get your head around layout etc.

AshimotoK0:
No night time running .that's on single phase Honda alternators.its 3 phase .. so same AC between any two yellow wires 

AshimotoK0:
This is Honda Bulletin on 3phase alternator on SOHC Fours
https://www.dropbox.com/s/2oqrx5cvv7byqao/3-phase%20Honda%20Charging.pdf?dl=0

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