To test the generator itself disconnect all the wiring from it and connect
the F and D terminals together. Connect a voltmeter between these terminals
and earth. Start the engine being careful not to rev it at this stage.
Slowly increase the revs and the voltage should rise rapidly and without
fluctuation. Don't exceed 20v, and it should reach this figure by 1000rpm.
If there is zero volts check the brush gear. If you only see half to 1v the
field winding may be faulty. If you only see 4-5 the armature winding may
be faulty. You can check both these with an ohmmeter between the F and D
terminals respectively, link removed, rotating the armature for that
winding. You should see a very low resistance on both, with very little to
no fluctuation on the latter.
If the voltage is good you can check the wiring by reconnecting it at the
generator and again linking F and D. Do the same test as before, removing
the wires from the F and D terminals of the control box, and checking you
get the same voltage as before on both wires. That's what the book says,
however that will only reveal a disconnection in the wires, you could still
have a high resistance fault. To detect that you will need to connect a
significant load such as a headlamp bulb to the wire while you are testing
the voltage on it. You should see very nearly the same voltage. If that's
OK as well, the problem is probably with the control box.
PaulH.
----- Original Message -----
>I looked at the brushes and the look fine. I did not remove the back plate.
>I
> could see the brushes through the slot holes. I checked the voltage at the
> back plate and it is 0.
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