Re: 12 volt conversion on 8N

Posted by Steve@Advance on July 26, 2019 at 13:32:52 from (66.169.147.211):

In Reply to: 12 volt conversion on 8N posted by rwsprouse on July 26, 2019 at 09:34:24:

Starting with the charging system:

Most 12v conversions use a 10SI Delco alternator.

If it has been converted to this type alternator, the regulator is internal.

There are 2 types of 10SI alternators, a standard automotive alternator with 3 wires.

There is a modified version that uses only 1 wire.

Both have a 1/4" stud electrical connection on the back, that wires directly to the positive battery cable.

If there is a 2 terminal plug on the back/side of the alt, that wires to the ignition through a resistor or diode, and to the battery terminal. See link.

If the terminal block on the back/side is covered with a rubber plug, it is a one wire, and only needs the battery stud wired to the battery. With any alternator, it is usually necessary to bring the engine to full governed speed to initiate the charge on start up.

Of course this is all assuming it has been converted to an alternator, and is the brand described. If it still has a generator, unless you are going for originality, replacing it with an alternator is the easiest, most economical, and reliable solution. With any alternator conversion, the system must be negative ground.

As for the coil, first determine what voltage the coil is designed to operate at. If there is a part number on the coil, research that, see if it requires a resistor.

If it says 6v, it needs a 1 1/2 ohm resistor.

If it says 12v resistor needed, it needs a 1 1/2 ohm resistor.

If it says 12v no resistor needed, it needs no resistor.

If there are no markings, you can test the resistance with an ohm meter. With the coil out of circuit, check across the + and - terminals. If 1 1/2 ohms, it needs a resistor. If 3 ohms, no resistor.

If in doubt, you can replace the coil with a NAPA IC14SB.

Also, if you keep the original coil and resistor, the resistor should be on the ignition switch side of the coil, not the points side.

While you are making these corrections, be a good time to look the rest of the wiring over. Very common to find crumbling insulation, farmer fixes, all kinds of problems with a tractor that age. The wiring is simple, don't be intimidated. With some internet research, Youtube, asking questions, you can do this!

• Wiring Conversion

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