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Old 05-09-2007, 11:17 PM
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one wire alt. from gen.

Howdy......I'm the new guy on the block and am impressed with the collective intelligence. I hope you can help me rewire a 57 Dodge Cornet V8. I want to switch from a 12 volt generator to a one wire alternator. what must I do with the 3 wires hooked up to the voltage reg. Do I run a 10 ga. wire from the Bat. terminal on the alt. to the +battery side. How does my ammeter get current, and how does the rest of the car get power to the lights, radio, etc ??? Thx. Jim

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Old 05-10-2007, 02:46 AM
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Doc here,

Connecting the ONE WIRE Alternator is simple.

Run a single 10 gauge wire to the battery cable starter terminal , with a proper fuse link (IE. If the alternator is 63 amps, run a 70 link, the wire will support it.)

NEXT, remove and connect ANY red wires at the regulator BATT terminal..These are the wires that feed power from the battery to other parts of the car via the Fuse buss. They must remain together, but removed from the regulator. The rest of the wires will get capped , marked and tied back. Remove the regulator.

IF you had an idiot lamp, it will no longer function, there is no provision for it on a 1 wire alternator.

Your amp gauge is probably NOT up to the task..(It may work, but could burn out the shunt, or damage the meter movement) IF it is an OLD STYLE -30~0~30 gauge..IF the alternator full loads, it will peg the meter, OR burn out the shunt (which MAY leave you without power) .

There are some options, remove the stock gauge from circuit, and install a modern gauge (-60~0~+60) in it's place, Observing polarity. DO this with the battery disconnected, as these wires have FULL battery power 24/7 and if you short them with a tool, you COULD start a fire.

OPTION 2 remove the wires from the gauge connect them together and insulate them well. Install a modern Volt gauge by connecting the red wire to any 12 volt switched wire, and ground, that's it! Much better AND SAFER to use, no high current wires under the dash to start fires it shorted, and reports the same data in Volts..once used to it, It's a simple glance to see if all's well!

OPTION 3 get a 60 amp shunt out of a modern gauge and convert it to run with your stock gauge (if Retro is the theme) Just multiply the readings by 2..this is the least desirable, it will work but has margin for error,and fire.

The power for your fuse buss (the rest of the car) should already be connected, either the red wires you left together from the old regulator, or may tie at the horn relay power, or at the solenoid wire to the battery, or a single terminal at or near the battery, OR through the amp gauge itself. either way, if you keep the red wires on the old regulator connected to each other when you remove the regulator, you should not need to concerned with it.

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