The brushes are part of the alternator. I guess I can explain it.
On the 650 it uses what is called a feild excited alternator. The feild is the magnetic feild that excites the stator to produce electricity. Thus feild excited.
To make this feild the rotor needs power from the battery. This power flows To the rotor through brushes.
On the early models 79 and older, when you turn the key on power flows to the regulator on the brown wire, from the rgeulator to the positive brush, through the rotor out the negetive brush to ground at the stator housing and the black wire to the wiring harness.
This creates a strong magnetic feild around the windings in the stator. Now when you start the engine, Now with the rotor spinning the stator starts to make electricity. At idle it won't make much electirity, as you rev the engine it makes more, This will run the bike and have some to charge the battery. The regulator reads the battery voltage, when the alternator gets the battery voltage up to the preset value, 14.5 volts, it shuts off the electricity to the rotor. As the bike runs it uses electricity, when the battery voltage drops below the preset voltage, 14.5 volts, the regulator turns the rotor on, it does this hundreds of time a second. This is how the regulator works.
On the 80 up bikes the regulator does the same thing, turns the rotor on and off, it just does it a bit different. The bike is wired a bit different. It sends power to the regulator on the brown wire but also to the positive brush. From the positive brushe through the rotor to the negetive brush. Now instead of grounding here power goes to the regulator on a green wire. Inside the regulator is a transistor the is contoled by battery voltage. When the battery voltage is below 14.5 volts the transistor turns on and grounds the rotor. This makes voltage, when the battery voltage gets above 14.5 volts the transistor shuts off. Turning the rotor off.
On you bike depending on the year the alternator needs different types of regulators.
You need to know what type you need and what type you have.
If yo have an 80 or later type alternator then where the wires come up to the connector, the green and brown wires are the brush wires. I think if you hook the blue and orange from the reg/rec to the brown and green from the alternator it might work.
I've never used a Mike's reg/rec so I'm kinda guessing here.
If you want to wait until someone with a bit more experence with one chimes in, fine.
If you do get it working, would you post just how you wired it so the next person with one can find a wiring that works?
I for one would like to know.
