Posted by John T on June 05, 2013 at 04:58:40 from (216.249.76.176):
In Reply to: 300 not charging posted by VA Gasman on June 04, 2013 at 18:27:29:
I cant quite follow all the wires on the picture. If thats a GM 10SI Alternator:
1) The small No 2 SENSE terminal should be wired to the big output stud which gets to the battery via the ammeter.
2) The small No 1 EXCITE Terminal should be wired to the input (From IGN switch NOT to coil) side of the Ignition Ballast Resistor. However, in series between the ballast input and the Alternators little No 1 Excite terminal, place a 10 ohm 5 watt resistor or diode to prevent coil feed back causing run on even if Ign is off.
3) Assuming thats a Neg ground Alternator as most are, the battery must be installed NEg ground.
4) An Ignition Ballast resistor normally runs fairly hot and on a 12 volt tractor you would have a 6 volt coil if the ballast is used.
5) If you have a 12 volt coil DO NOT USE THE BALLAST and the No 1 Excite terminal above wires (via the in line series resistor or diode) to the coils input (NOT to distributor) instead.
6) Even a 12 volt coil runs somewhat warm but NOT so hot you cant hold it. Sure its a 12 volt coil ??? If its labeled "12 volts for use with ballast" its a 6 volt coil and needs a ballast just like it says or it will ovberheat. A 12 volt coil may be labeled "12 volts" or "12 volts NOT for use with ballast" etc
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