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jdemaris
05-04-2004 19:24:04
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Re: JD450 alternator conversion to internally regu in reply to Chip, 05-04-2004 14:43:23
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I think Broken Wrench misunderstood - unless I am misunderstanding you. You got rid of your piggyback Motorola and put on a Delco 10 or 12SI with the internal regulator and two prong plug on top - correct? If so, #1 gets switched 12 volt positve. It is the exciter connection to get the fields going. On many diesels you can just hook it to the IGN terminal of the ignition switch. With a gas engine - or a diesel with an electric shut-off, it gets a little more convuluted because once the alternator gets charging, the key won't turn the engine off. But, you have a diesel - right? If your diesel has a mechanical shut-off on the throttle cable (very first 450s) you're fine. If you have an electric shut off with a wire going to your injection pump, then you'll either have to wire #1 to the ACC position of your ignition switch, or hook #1 to the IGN terminal of the ignition switch, but put in a diode so power can go to #1, but cannot come from it and backfeed. #2 gets 12 volt positive full time, and can be run through an idiot "charge indicator" light if desired. In reality, on a tractor, #2 can be jumped directly to the the big charge post on the alternator if you don't need a idiot light. What you said about running it back to the battery is theoretically true, but mainly only applies to machines with long runs of wiring, i.e. cars and trucks. In those cases, there are slight variations in system voltage from one end to the other. On your 450, it won't make a difference. Also, if ever desired - but I cannot imagine why - there are self-exciting internal regulators available for your alternator. I don't like them, but they DO work. It elimates any wiring other than the battery-charge wire to the large post.
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