Posted by mkirsch on December 11, 2014 at 05:08:11 from (72.45.143.81):
In Reply to: 12v warning light posted by bass on December 11, 2014 at 04:46:26:
Depends on which Delco alternator you use.
If you use a 1-wire alternator, you don't need the excite circuit that the light is part of. In fact there won't be any "1" or "2" terminals, only "BAT," which you hook to the ammeter.
The typical 3-wire alternator needs the light, or a diode, in the circuit to prevent the alternator from backfeeding the ignition coil with the switch turned off, preventing the tractor from shutting off.
You could, if you wanted, wire up a separate "excite" switch that you push after you start the tractor, to get the alternator to start charging. Some people have done that, but most prefer it to be "automatic."
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