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Re: I understand your question . . .
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Posted by jdemaris on December 22, 2005 at 17:22:48 from (66.218.22.87):
In Reply to: Need some ideas on how to hook up an alternator-2 posted by old on December 22, 2005 at 16:58:41:
You didn't say what model alternator, but I'll assume it is a 10SI or a 12SI with a plug on top for a two-prong connector - marked #1 and #2. And I'll assume you know for sure that it has the original volage regulator inside of it. #2 can be hooked to the big output terminal. But - #1 is the exciter wire and it must get some battery current to get the alternator to start charging. Once it does start charging, power is no longer necessary in that circuit. But, if you do not have a switch, and leave it hot all the time, it will drain the battery. And yes - I understand what you said about not having a switch. For your situation, usually the voltage regulator inside the alternator is changed over to the self-exciting type. Then, you don't have to hook any wires to it - as someone else already mentioned. Once that type of regulator is installed, it is usually referred to a "one wire alternator" for obvious reasons. Now, if you refuse to spend any money on adding anything - and want it to work without using magic - you can hook #2 to the big output terminal, leave #1 not hooked to anything, and every time you start the tractor -take a jumper-wire and momentarily put 12 volts to the #1 terminal. It will then charge fine until you get done using the tractor and shut it off.
I could mention some other convoluted ways of doing it - but they all require extra parts.
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