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Old 09-01-2007, 02:50 AM
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How do I wire a 3 wire alternator when I used to have a 1 wire alternator???

Hi, I switched from a 1 wire alternator to a 3 wire alternator and I'm not sure how to wire it up. The new alternator has the voltage regular in it as did the old one & it's a small late model alternator. It's a small block Chev in a '32 Ford. I hooked up the main hot wire to the new alternator just like the old one was hooked up. I then plugged the new wiring harness connector into the voltage regular that's in the alternator. There are 3 wires coming out of the connector. A large red wire which I ran to the main alternator hot connection & then a small brown wire & a small black wire. Where do I hook up the brown & black wires??? Oh, this is a temporary hook up until I get my new 1 wire alternator in the mail. As it is now {without the brown & black wires hooked up} when I run the motor it only shows it charging 4 to 6 volts on the volt gauge. Thanks a bunch! Bill

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Old 09-01-2007, 03:02 AM
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Doc here,


jump the small red to the big red..that comes from the starter solenoid,

the black to the charge lamp..it will work..

If you get lost..TONS of this are in the knowledge base..


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Old 09-01-2007, 03:24 AM
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....THANKS Doc, I put the small red wire on the alternator post that goes to the starter solenoid. What I got out of a search was that I need to run the black wire to a switched on/off hot wire & the brown wire to the gauges??? Is this correct??? Thanks, Bill
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Old 09-01-2007, 08:41 AM
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Here is a diagram. The wire labeled "indicator light or resistor" connects to a 12 volt switched source (Ignition switch) that is hot with the switch in the ON position and off when the switch is turned off. I use an "idiot light" but a Radio Shack diode # 1N4001 can be used instead to prevent "run on" after the ignition switch is turned off.
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Old 09-01-2007, 08:50 AM
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Hmmm I always just wire the largest wire on the plugin to the ignition switch, on with the switch off with the switch, never had any problems with run on, course I'v only done two or three.
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Old 09-01-2007, 12:35 PM
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....THANKS Frisco, THANKS Holder! ... I'll go hook the second wire up to a switched source.... Bill
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Old 09-02-2007, 03:02 AM
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....yep, that did it, it works! THANKS again to all, Bill
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Old 09-05-2007, 10:01 AM
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Great Deal!
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