grandpa Love
Well-known Member
I asked the other day and most folks said buy an alternator...... question was will this work on an A with a mag? Does it need a cut out relay,or voltage regulator? Thanks
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Janicholson
Well-known Member
Yes. Does it work? I would make sure it passes the motor test. Use jumper cables and ground the frame, then touch the A terminal. It should turn at a good speed. (not powerful, but nice) then while turning ground the field terminal with another jumper. If it slows down, the field is good. Don't run it more than a minute. Jim
Bob M
Well-known Member
If it passes the "motor test" as JimN outlines it should work on your A.
You'll need to wire in the regulator (square box in the photo) for the generator to work.
It does NOT get wired to the magneto kill switch. The generator/regulator combination work completely independent of the ignition switch. When the generator reaches it's cut-in RPM the regulator will automatically connect it to the battery, and disconnect it again when the generator slows down or stops spinning.
Note the OEM generator does NOT use a fan - there is nothing missing off the pulley.
You'll need to wire in the regulator (square box in the photo) for the generator to work.
It does NOT get wired to the magneto kill switch. The generator/regulator combination work completely independent of the ignition switch. When the generator reaches it's cut-in RPM the regulator will automatically connect it to the battery, and disconnect it again when the generator slows down or stops spinning.
Note the OEM generator does NOT use a fan - there is nothing missing off the pulley.
Janicholson
Well-known Member
With respect!! The cutout relay in the VR shown is that switch. No extra switch is needed. Jim
Janicholson
Well-known Member
The high Low Dim Bright 4 position switch is used with a cutout relay, and lights. The switch is always grounding the field in the generator. In the L position, the field current goes through a resistor to create a charge rate of about 3 to 4 amps which maintains the battery with no lights. The H D B positions are full field ground, creating enough extra current to replace charge the battery if started and stopped multiple times in one day, and to maintain the battery with the lights on.
The cutout disconnects the generator from the battery, isolating it so it cannot draw current when stopped. or going so slow that the charge voltage is less than the bat voltage. When the generator produced enough voltage (with only the residual magnetism in the iron of the gen field poles making the volts) to be more than the battery volts, it closes its contacts and connects the Armature to the battery. That Arm terminal on the gen is also where the field gets its voltage (or a third brush) to make the field energized to be grounded by (the voltage regulator in this case, or the light switch in the case of a 4 position switch. Jim
The cutout disconnects the generator from the battery, isolating it so it cannot draw current when stopped. or going so slow that the charge voltage is less than the bat voltage. When the generator produced enough voltage (with only the residual magnetism in the iron of the gen field poles making the volts) to be more than the battery volts, it closes its contacts and connects the Armature to the battery. That Arm terminal on the gen is also where the field gets its voltage (or a third brush) to make the field energized to be grounded by (the voltage regulator in this case, or the light switch in the case of a 4 position switch. Jim
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