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Ford 9N, 2N & 8N Discussion Forum

12 Volt Conversion-1 wire alternator

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RHKirk

02-09-2004 09:12:08

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My 8n has been converted to 12 volts and hass the 1 wire alternator setup. It is a side distributer with a 6 volt coil. Where can I find a wiring diagram for this setup? I have found various diagrams, but none for the one wire setup. It has a new starter button on it with 2 wires attached and I would like to back to the old original button, but as far as I can tell it only has 1 wire attached to it. By the way I would be up a creek without this site. Thanks!

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Dave OH

02-09-2004 22:41:58

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Re: 12 Volt Conversion-1 wire alternator in reply to RHKirk, 02-09-2004 09:12:08

This is not a direct wiring diagram for an 8N site. But it is the "BEST" site I have ever found to explain both the one wire and the three wire alternator systems. And also great information about "Voltage Sensing", for alternators. Go to: www.madelectrical.com/electrical-tech.shtml
Some day I will learn to post a direct link into a message.
Dave OH

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Bob

02-09-2004 09:55:39

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Re: 12 Volt Conversion-1 wire alternator in reply to RHKirk, 02-09-2004 09:12:08

You need a starter solenoid with one side of the the coil internally connected to the large terminal on the solenoid that the battery cable is connected to. This type of solenoid will engage when the small terminal is connected to chassis ground, which is what the tranny-top start button does.

MOST automotive solenoids are NOT set up this way. They are wired internally with one side of the solenoid coil connected to the metal mounting base, and the other side connected to the small terminal labelled "S". These solenoids engage when 12 Volts is applied to the "S" terminal.

A 6 Volt solenoid specifically listed for an 8N will work, even though your system is 12 Volts because of the limited time it is energized for cranking. There are 12 Volt alternatives, but that makes the hookup more complicated.

To sum up... get a 6 Volt 8N solenoid. Make SURE your battery cable is connected to the large stud on the solenoid labelled BATT. Connect the other large stud to the starter.

Run a small (14 or 16 gauge) wire from the small terminal on the solenoid to the terminal on the transmission cover start switch. That's all there's to it!

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