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How do I wire this to my alternator?

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I bought this a long time ago and forgot how to wire it. Do I just connect the ring terminal to the post on the back of the alternator and then run a wire from there to the batteries?

1864711-04-04_002.jpg
 
That's how mine is hooked up. I don't have a plug, but the wire runs from the post on the alternator over to the battery.

I had a 6.2 with dual alternators, so when I swapped in the 350 I had to do new wires for the alternator.
 
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I bought this a long time ago and forgot how to wire it. Do I just connect the ring terminal to the post on the back of the alternator and then run a wire from there to the batteries?

1864711-04-04_002.jpg


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Yes you are correct. plug the harness into the alternator, attach the red wire with the ring terminal onto the post at the rear of the alternator, then run a large 8 or 10 gauge wire from the alternator post to the battery.
 
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I believe it is a jumper setup for a one wire alternator hook up. /forums/images/graemlins/thinking.gif

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That is correct. That red wire is effectively a jumper to provide 12 volts to effectively "start" the alternator.
 
Wow, that sounds interesting, but I don't get it. Doesn't an alternator always charge when it is spinning?
 
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Wow, that sounds interesting, but I don't get it. Doesn't an alternator always charge when it is spinning?

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It will only charge if its hooked up to the battery
 
You can kinda think of the alternator like a pump. If line pressure is the same as pump output pressure the fluid doesn't go anywhere. If line pressure drops below pump pressure, the pump starts putting out fluid. With the alternator the voltage is pressure and current is the fluid.

Does that help?
 
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I believe it is a jumper setup for a one wire alternator hook up. /forums/images/graemlins/thinking.gif

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That is correct. That red wire is effectively a jumper to provide 12 volts to effectively "start" the alternator.

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I don't understand the "start" the alternator thing. Does the circuit turn on the alternator in some way when it needs current?
 
the 12Volts to that connector provides voltage to the "field" of the alternator. The spinning alternator rotor in this magnetic field, is what causes the generation effect of the alternator. If you do not hook this 12 volts to the "field" of the alternator, all you would have is a spinning hunk of iron...

The one wire aftermarket alternators have this built into the alternator, but most require a certain speed to "start" the alternator. Most see this when they have to rev the engine right after startup to see the alternator kick on. (ie right after startup a voltmeter will read just 12 or so volts - essentially battery power....when you rev the motor and bring the alternator up to proper speed, it will start generating, and your voltmeter should read 13-14 volts.)

Not sure if I am gettting the point across... /forums/images/graemlins/dunno.gif
 
Right on the nose....exciter wire... /forums/images/graemlins/waytogo.gif /forums/images/graemlins/usaflag.gif
 
I get it, good explanation. Learn something new everyday.

-Chris
 
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Where did you get the plug from?

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I got mine from the local Napa store. I think it was around $12 or $15. I bought it to make it easy to wire the alternator in a vehicle that had no wiring, but have since scapped the vehicle. I guess I will use it on my K-20 to get rid of some extra wires. They also work good for wiring demolition derby cars.
 
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