Re: Need JD wiring help

Posted by jdemaris on December 03, 2005 at 08:07:22 from (66.218.12.199):

In Reply to: Need JD wiring help posted by todd in ne. on December 03, 2005 at 06:29:40:

The one-wire Delco is most likely just a conventional three-wire model (10SI or 12SI) with a self-exciting regulator installed into it. If it's drawing the battery down, there is something wrong with it - it's not a design flaw. Usually a bad diode internally. Seems it would be a lot easier and cheaper just to fix it.
The alternator with its original regulator is a two wire hook up for most tractor use. When it is installed in a car, it uses three wires because the length of the wire-run between the alternator and battery. You've got nothing to gain by using the third wire - but of course, you can if you want.
#1 connection goes through the charge lamp (if you have one) and then to the IGN post of the ignition switch. #2 is the "third" wire hookup. For a tractor, all you need to do is hook it to the big output post on the alternator - and then a heavy wire is run from that big post to the positive terminal of the battery. It should be capapble of carrying the full amp. output of the alternator - probably 8 gauge wire. In a car, the #2 wire often has its own wire that runs all the way to the battery instead of getting fed by the output lead. This is to sense minute differences in battery voltage that might exist over long runs of wire.
The one problem you're likely to have with a gas engine is the inability to shut it off. Once the alternator starts charging, it sends 12 volt current back to the IGN terminal - so even when you turn the key off, the alternator keeps sending power and the igntion stays powered. This can also happen with a diesel if it has an electric shut-off instead of manual. There are at least two easy ways to fix this. If you are using the original key switch - just put a diode in the IGN post and #1 circuit that feeds the alternator. This will let power go to the alternator, but not come back. Now, if you have an automotive type ignition switch that has a IGN and a ACC post, feed the alternator #1 circuit from the ACC post instead of the IGN. This way, when the key is off, the ACC terminal is totally isolated from the IGN.

Replies:

• Re: Need JD wiring help John T 11:37:19 12/03/05 (0)

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