Hagen Brothers farms,Goodrich ND | JDAmericanFarmer - 2/3/2017 11:51
Am I correct that the number 1 terminal should only got when the key is on? And #2 terminal is always hot? Must have a bad or broken wire because have no juice at at all. But I think I found the same wire up by the firewall as it has power with only the key on and it looks like a regular wire but it only has one little tiny actual wire in it. And could I cut it and splice a new wire down to the alternator or will there be an issue since that wire is just one little tine wire inside?
That single strand resistor wire is a common failure on 30-40-50 series JD's. The resistor wire kit from JD is a bit expensive IMO , seems I remember about $50. What worked on my 4450 was to salvage a two wire side marker light from a 70's Ford car, wire one wire of it into the firewall connection where the resistor wire goes,, zip tie the light to the engine breather tube, and use standard non resistor wire from light to alternator #1 terminal. The light serves as the necessary resistor, and gives you a visual indicator that the alternator field circuit is working. My cost was less than $2.
One thing I see in your picture that always scares the jeebers out of me is bare terminals plugged into the alternator. That #2 sense wire is only 1/8 inch from touching the alternator case and is direct to the battery with no fuse. If something tugs on that unfused wire and shorts it to the alt case, your harness/ tractor/ tractor shed will burn up, as that wire will be red hot in seconds. To make it safe, a Delco alternator harness repair plug is only $3 at your local auto parts store. It makes it a safe and professional looking repair.
Edited by Jon Hagen 2/3/2017 14:25
 (Alt plug kit.jpg)
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 Alt plug kit.jpg (80KB - 102 downloads)
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JD 4440 alternator wiring ?
