SOHC.co.uk Forums > CB350/400
1997 CB400 Four charging issue 🤯
Gaz_hay:
--- Quote from: Gaz_hay on May 04, 2026, 12:27:40 PM ---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
--- End quote ---
Have got the side cover completely off and added 12v down the white and earth down the green and my coil is working fine,
I’ve checked white wire out of the regulator and no 12v is being sent to the coil hence no charging (I’m guessing )
By reading up…. I’m sure the black wire to the regulator is the 12v ign feed and also shows the regulator the charging status …. So next test would be to see if I have any voltage on the black wire with the ignition on… thinking this is correct 👍
exvalvesetdabbler:
Black wire is switched 12v that supplies 12v everywhere when the ignition switch on
With the regulator connected up, ignition on you should be seeing battery voltage on both black and white wires. IE full 12v going out to the field coil.
With all wires disconnected from the regulator you should have continuity between the spade terminals on the reg for black and white wires.
From the black wire you should have continuity to any other black wire on the bike even with even with gnition off.
Are you missing 12v from anywhere else? Inside the wiring harness where the black wires are joined is by a soldered connection so if you have lost 12v at the regulator I would expect it to be missing somewhere else, or the evidence is pointing the individual wire and spade connector feeding the reg.
With your spanner close to the coil give the black connector a wiggle with ignition on.
Dave.
Bryanj:
Sounds like the bullet connectors down by the neutral switch to me
Gaz_hay:
Thanks guys, will double check the black wires tomorrow and white as mentioned above, wil also double check all connections and bullet connectors … will update you all tomorrow 👍 thanks all for the input would be lost without the help much appreciated
Bryanj:
The Honda charging system is very robust and i have never seen a field coil or stator fail unless damaged in an accident, i have seen a small number of regulator fail, espicially where bike have been stood for a while.
The only difference between 400 regs and all the other fours is the angle the spade connectors are at.
DO NOT be tempted to play with the adjusting screws on the coils and contacts they need to be set on a regulated power supply, mine died and i dont have enough reason to replace it now
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