Re: self energizing regulator.

Posted by John T on April 21, 2006 at 17:00:09 from (66.244.90.5):

In Reply to: self energizing regulator. posted by bng9_2000 on April 21, 2006 at 15:50:33:

bng, The GM 10 SI is cheap and readily available, it requires NEGATIVE ground, its easy to "excite" if wired as described, it begins charging at less RPM then some of the one wire units and shouldnt place any small trickle discharge on the battery when shes setting like some one wires could. Heres how I wire them on a gas tractor and I highly recommend the use of the current limiting protection resistor whereby the diodes often not even needed.

Heres how I wire a GM 10SI Alternator and remember, it requires NEGATIVE GROUND !!!!!!!

The big rear main output alternator terminal goes to the wire that used to be connected to the BAT terminal on the Voltage Regulator or Cutout Relay. HOWEVER if that wire wasnt already upgraded, when I convert from a Genny to an Alternator, I replace that wire with a 10 Gauge and it runs from the alternators main output up to the LOAD (NOT to battery/starter) side of the ammeter. I also replace/use 10 Gauge from the ammeters other SUPPLY terminal to the battery/starter.

The little side number 2F Voltage Sense terminal gets connected (use a short 14 jumper wire) right up to to and with the big side terminal just mentioned.

For the little 1R side Excitation terminal, run a 16 or so gauge wire from the ignition switches IGN (which is HOT ONLY when ignition is turned on) terminal and in series with it place a 10 ohm 5 watt current limiting resistor (dont really need that much wattage power rating, but they are heavy duty built and easy to wire). Then in the rare event the tractor continues to run cuz of alternator backfeed when the ignition is switched OFF, I add in series a 5 amp 50 PIV minimum Diode. The diode must be wired with negative cathode end to the alternator and positive anode end to the switch. Again, the ratings are not that exact but about any diode over a few amps and 50 volts or so works.

Dont forget to change the battery to negative ground and the coil needs to be wired so the negative goes to ground via the distributor points and the positive gets power from the ignition switch and you have to reverse ammeter leads also if your just now changing polarities.

Good luck Ol John T in Indiana

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