Posted by Jon Hagen on March 21, 2009 at 17:49:33 from (12.175.230.56):
In Reply to: Farmall M overcharging posted by Shawn in PA on March 20, 2009 at 21:40:03:
Does your alternator conversion use a diode in the #1 excite wire to the alternator ? If so then they will draw about 3-7 amps to excite the alternator plus another 4 plus amps for the ignition coil, so 9 amps draw when you tuen on the ignition is about normal. If your alternator conversion uses a resistor or charge indicator light instead of a diode, they will limit the alternator excite current to about 1/2 - 1 amp
As others have stated, the overcharge is likely related to a bad connection in the #2 sense wire to the alternator plug. Do you have the #2 wire in the alternator plug connected to the big "BAT" stud on the alternator rear ? That is a good place for the regulator to sense system voltage and adjust alternator output to about 14.5 volts. Many regulators on Delco 10 SI alternators are set at 14.6-8 volts,anything under 15 volts is OK.
For some unknown reason,the blade connections on most of those regulators are unplated steel and will rust if exposed to weather. Make sure the plug and regulator blades are free of corrosion, and coated with electrical grease to protect them.
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