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Ardie, I have absolutely no data on that Hitachi Alternator but can offer some general info regardless. I pretty much agree with Hal that I doubt you need any wires to the coil etc (see below) 1. The only reason on the more commonly used GM 10SI family of alternators a wire ran from the coil to the alternator and a diode was needed to prevent backfeeding the ignition, was cuz the ignition feed circuit was only hot when the Ignition was ON and that was used to excite the GM alternators. If thats not an issue on the Hitachi (i.e. no external excitation is required) theres no need for any wires or resistors or diodes etc. from the alternator to the coil. 2. If the tractor uses an ammeter, the big main alternator output would wire to its load (NOT to battery/starter) terminal instead of direct to the battery so current into or out of the battery is properly measured. If no ammeter or a voltmeter is used, then the alternators main output would wire to the battery. 3. On the GM alternators, the batterys voltage is sensed on its lil No 2 side terminal which is supposed to wire to the battery, but we cheat and tie it to the main output. Im not sure if that Hitachi needs any external voltage sense indicator or not????? I guess the bottom line is to wire the alternators big main output either to the battery or via the series ammeter if it uses one,,,,, ,,,no need to wire to coil or use any diodes or ballast if the Hitachi dont require any excitation voltage source,,,,, ,,If it requires a voltage sensor circuit, that could wire to the battery or be cheated off the main output which gets to the battery eventually. NOTE If anyone is familiar with that Hitachi alternaotr do as they say over me. John T
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