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Old 07-11-2012, 19:12   #1 (permalink)
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Alternator

Okay so I have an alternator from a 99 explorer. I want to create a diy mini generator and my alternator has a 3 pin plug a place where the output bolts on and the body is ground. what do I need to do to make it output. I have a system turning it but with a multimeter hooked up I only get .10 volts I hear that there is some kind of field wire and a stator? on the plug there is an I and and A for the outter pins.

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Old 07-11-2012, 19:17   #2 (permalink)
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Re: Alternator

The battery "flashes" the stator until the alternator is turning fast enough to pick up the load, then it supplies it's own power, which is another reason why your alternator puts out a higher voltage than the battery.
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Old 07-11-2012, 21:28   #3 (permalink)
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Re: Alternator

I've done this before but with a Delco alternator which only had two prongs.
How I did that one (going by memory) Cable from the battery to the terminal on the back of the alternator. Ground from the Battery to the alternator case. Made a jumper wire from the hot lug on back of alternator to prong 2. Prong 1 would go to a 12v switched source such as a ignition switch or toggle switch.

Your alternator should set up as shown below.



I terminal
runs to the gen light. (Not used)

S terminal
simply jumpers over to the stator plug.

A terminal
runs to a switched 12v source. A wire from battery with toggle switch will work fine.

Batt lug to Battery +

Ground to case.

--------------------------

I've read of two different ways to wire this. If above does not work, Run a jumper from the Batt terminal on back to alternator to A. Run your switched 12v power to I and S jumper to S.

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