Re: alternator conversion

Posted by Tyler(WA) on February 28, 2001 at 09:12:46 from (12.13.226.14):

In Reply to: alternator conversion posted by Ron on February 28, 2001 at 06:52:52:

I hope the article link will help. It sounds like your exciter field is back-feeding your ignition. It's common with some applications. You can fix this by installing a diode in the exciter line from the ignition (coil) to the alternator.

Your ampmeter problem is different. There are 3 connections you need to work with. Take the big lug (regulated output) and run that to the plus side of your ampmeter (the side that's not connected to your battery.) The sense line should be the #2 spade lug on the alternator but you should confirm this anyway. With the tractor running, touch a wire from the output lug (connected to the battery or ampmeter) to #2 and then to #1. One of these is the exciter line and the other is the sense line. The sense line is very high impedence and will not draw any spark (we're looking for a very small spark.) The exciter line actually draws some current and will draw a little spark (not much) as you touch it with the battery voltage. Connect the snese line directly to the output lug of the alternator and run the exciter line to the ignition circuit of your key switch/coil. If this still keeps your ignition powered after turning the key off, install a diode in the exciter line.

Diodes have an anode and cathode side. The cathode side usually has an identifying band marking it. Attach the anode side to the ignition and the cathode side to the alternator. This should allow current flow in only one direction and prevent a back-feed from causing run-on.

I hope this helps. E-mail me if I can help you further.

• Updateing your charging system

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