Tractor Repair: Alternator (Delco Remy 3 Wire) Wiring Diagram, delco remy, wire alternator

Question
I am attempting to rewire a Ferguson Tractor to accommodate a Delco Remy 3 Wire Alternator. I am looking for a diagram and directions that include the instructions on Diode selection or Amp Meter or Warning Light integration to ensure low speed charging and no inappropriate backfeed or battery drain. I would prefer to stay with a 3 Wire system and not a 1 Wire.

Thanks.

Answer
Hello,

  I really don't know where to get a diagram.  I sort of learned by trial and error and gained some experience in the 20 years I have been working on tractors.  

  A Delco with internal regulator and 3 wire hookup is an excellent choice, and is not difficult to wire up.  The main larger diameter power wire goes onto the large stud terminal with the nut, and then a jumper wire is connected from that same terminal to the small spade terminal that is farthest from the large one, so these 2 terminals will be live all the time, and fed by the wire attached to the starter and up through the amp gauge.  The other small spade terminal that is closest to the stud terminal is powered by the key switch so there is only power there when the switch is on.  If it's a gasoline engine, there's a problem unless there is a diode installed inbetween the switch and the alternator.  Since this is a common connection with the power fed to the ignition coil from the switch, power will feed back from the alternator to the coil with the switch off, so you can't shut off the engine.  There is a diode available that is prewired into a flat plastic plug that plugs right onto the 2 small spade terminals of the alternator.  Some auto parts dealers and tractor repair shops will have this diode or will know where to get one.  If it has a charge light, the wire should go from the switch, through the light, and then to the alternator.  If it was previously a 6 volt system, don't forget to install an ignition resistor, or install a coil with an internal resistor, and wire the amp gauge polarity and battery polarity for negative ground, and put on 12 volt lights.

                   Good luck,

                         Arnie