JD 40 12 volt conversion

kwoods · Sep 24, 2018

Can someone show me a wiring diagram for a 1 wire alternator conversion on a 40?

old · Sep 24, 2018

For a 1 wire you just hook the wire to the load side of the amp gauge and your done.

kwoods · Sep 24, 2018

(quoted from post at 15:02:41 09/24/18) For a 1 wire you just hook the wire to the load side of the amp gauge and your done.

Do I have to switch coil polarity also?

old · Sep 24, 2018

If it was + ground with an alternator you need to switch to - ground so yes good idea to switch coil wires so the coil is also wired for - ground. It will work either way as for the coil but the spark will not be as good if left + ground at the coil.

James Howell · Sep 24, 2018

Yes.

Take a look at the [b:654c4848f0]Lamps and Ignition Wiring[/b:654c4848f0] diagram below.

Note the "[i:654c4848f0]original[/i:654c4848f0]" POSITIVE ground electrical system.

Also note the BLUE wire from the ignition switch to the NEGATIVE terminal on the coil.

If the 12 volt conversion is to NEGATIVE ground, then connect the BLUE wire from the ignition switch to the POSITIVE terminal on the coil.

Take a look at the BLUE wire on "BW" our 1954 Model 40T.

Hope this helps.

JD 40 12 volt conversion

kwoods

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old

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kwoods

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old

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James Howell

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