SOHC.co.uk Forums > CB350/400

2 Extra wires from my rectifier

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AshimotoK0:
There needs to be a current controlled through the field coil which induces magnetism into the crank rotor. The alternator output is controlled by adjusting the current in the field coil. I guess the extra two wires are used for field coil excitation but the reg/rectifier would specifically have to be designed for the Honda4 SOHC I would think. If you are not using that part of the regulator/rectifier and using the standard unit  regulator unit, I guess you would just insulate and tape away the spare wires.

Ash

Drew400:
Yes indeed: the red thing (electronic ignition unit) is now under the seat. I have a solenoid cover on order. Sadly, no luck as yet with my 'desperately seeking' fuse box cover and my solenoid-to-loom connector will be here tomorrow! It won't be perfick but it will be better, sir.

Cheers, D.

Drew400:
Ash, I think I understand about 50% of your post but I'm grateful for your expertise.

The good news is that the bike came with that unit and was running well until I pulled it all apart. So I'm confident it will work again with this bit of kit and without the old regulator wired in (one of my old photos does after all show that it wasn't connected to the black and white cables).

Cheers,

D.

Lobo:
Alas... that bloody fuse box cover does go walk-about as it were. I was in the same boat as you but ended up buying a whole new fuse box...

Good luck in your hunt!

AshimotoK0:

--- Quote from: Drew400 on February 15, 2015, 04:56:21 PM ---Ash, I think I understand about 50% of your post but I'm grateful for your expertise.

The good news is that the bike came with that unit and was running well until I pulled it all apart. So I'm confident it will work again with this bit of kit and without the old regulator wired in (one of my old photos does after all show that it wasn't connected to the black and white cables).

Cheers,

D.

--- End quote ---

Hmm mystery how that works then? Without power to the field coil on a Honda 4 ( the centre coil with two wires only)  you will be reliant on the very, very low permanent magnetism in the rotor, which theoretically should give you sod all output or nothing at all. If it was a twin that would be different because they have permanent magnet rotors. The Honda/4 charging system was state of the art when it came out because it doesn't use brushes and slip rings like all of the car Alternators at that time. That centre coil when powered up 'induces' electro-magnetism into the rotating steel rotor on the end of the crank without using slip rings. The standard regulator servers to adjust the current through that centre 'field' coil and vary the alternator output as demanded by the electrical systems/battery on the bike. Not trying to confuse you just puzzled!


Ash

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