Posted by John T on October 16, 2009 at 05:03:44 from (66.244.97.31):
In Reply to: Diode Question posted by Pete7 on October 15, 2009 at 16:32:37:
I recommend instead of a diode to use a 10 ohm resistor (or even a small incandescent idiot light charge indicator) because it serves dual purposes... (and its cheap n easier to wire with no polarity concerns)
1) It provides at least some degree of safety current limiting........A much larger (higher ohms) resistor will work even provided theres still enough curent to excite the alternator at start up BUTTTTTTT if you use an idiot light use a small incandescent as an LED is too high resistance
2) It prevents "run on" if the tractor doesnt die when you turn off the ignition. Thats the purpose of those diodes to prevent reverse current flow out of the alternators lil No 1 terminal from powering the coil (if wired as most do) even if the ignition is turned off...Likewise the resistor can prevent run on
OKAY Ive seen them work fine with a diode,,,,,,,,with no diode,,,,,,,with a 10 ohm and much larger current limiting resistor,,,,,,,with an idiot light,,,,,, SO TAKE YOUR CHOICE
Im talking about GM 10 SI 3 wire alternator wiring here ya know
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