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Old 05-06-2012, 08:14 AM   #4
Scott H
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Join Date: May 2010
Location: Wheaton, IL (west chicago)
Posts: 550
Default Re: Flathead 8BA Wiring Help - Temporary Start Up

Just for starting purposes while its sitting on the frame you won't need to worry about wiring the charging system. You WILL need the 12 volt coil.

You need power to the starter that you can interrupt, either with a switch or by just touching the connections together (a momentary pushbutton switch is preferred)

You need power to the coil that you can interrupt, again a switch is preferred so you can cut the power and stop the engine.

Are you going to have a negative ground along with your 12 volt conversion?

If so, from the battery use a thick cable from the negative post and attach the other end to a bolt on the engine. Run a thick cable from the positive to one side of your switch, and then continue it from the other side of your switch to the starter. When you flip the switch the starter should spin adn the starter should stop when you cut power at the switch.

For the coil, run a standard wire from the negative side of the battery to the GROUND side of the coil.
The run a standard wire from the positive side of the battery to a switch, from the other side of the switch to your resistor. From the other side of the resistor to the BATT side of the coil. Flipping the switch will give you the stepped-down voltage you want to the coil so the coil doesn't burn out.
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36 1/2 ton pickup
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