Posted by Bob on April 13, 2010 at 12:03:20 from (69.178.228.68):
In Reply to: Re: Alternator help posted by Zachary Hoyt on April 13, 2010 at 11:40:03:
If you had the engine running when you took those voltage readings the alternator isn't working.
I numbered the terminals for you... #1 gets voltage only when the switch is "ON", and should have an "idiot lamp", diode or resistor in-line to prevent the backfeeding of current OUT that terminal.
#2 is the "voltage sense" terminal and on automotive apps it's connected to a point near the (+) battery cable to sense voltage as close to the battery as possible. For theses simple tractor conversions it's typically just jumpered over to the alternator's large output stud.
It's a 10SI Delco. Simply ask the autoparts folks for an alternator for a 1975 Chevy pickup with 350 engine, NO air conditioning (unless you want a HIGH output unit).
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