Folks, I recently acquired a IH 414. I would like to convert it from positive ground to negative ground system. A one wire alternator is envisioned to get rid of the generator and voltage regulator. I'm pretty sure how to do that. Also an ignition switch with a glow plug activation (accessory position) and with a start/run position (rather than a starter button). I am confused on the glow plug wiring and voltage needed for the glow plugs. Do I disconnect the current ground strap on the glow plug at the front of the engine and just wire the plugs to the 12 v accessory position on the ignition switch or do i need a resistor in series to change the 12v to something else to the glow plugs. If so what OHM and wattage resistor?