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1997 CB400 Four charging issue 🤯

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Bryanj:
The reg does not switch at revs but at a prest voltage, as the generator output is based on both the field coil power input AND the revs it means that the reg allows charging till the battery voltage hits a specific level, its all in the pages i attached

Gaz_hay:
Thanks everyone for the info / replies
Will try and get my head around diagrams etc that have been attached, I’ve also checked all the plugs on the charging system and all in good condition not corroded.
I will check the magnetised idea on side cover later ….

Thanks for baring with me I’m not the best on electrics or even using the internet forum.


Much appreciated 👍👍👍

exvalvesetdabbler:

--- Quote from: Bryanj on May 03, 2026, 12:32:57 AM ---The reg does not switch at revs but at a prest voltage, as the generator output is based on both the field coil power input AND the revs it means that the reg allows charging till the battery voltage hits a specific level, its all in the pages i attached

--- End quote ---

I was trying to simplify things a little, the transition voltage where the resistor is switched in  series with the field coil should be in the manual.

At 15v the contact does short the field coil feed, now through the resistor to ground. Once the voltage drops below 15 the contact opens again.  This off/on happens very fast and essentially modulates the feed to the Field coil to keep the voltage under 15v.

Dave.

Gaz_hay:
I have no field coil activity by the looks with the ignition on the coil is not magnetised,  does anyone know what the resistance between the green and white wire to the coil should be or any other tests I should do before swapping out the field coil
Thanks

Bryanj:
All in the Honda manual which i think is downloadable from Ashs dropbox or Alladins cave

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