calling John T 24volt system

I have a 4010 jd with the 24 volt system and am having charging troubles. Motor tested the gen, checked the vr still getting no charge. New batteries, cables, new vr, new brushes in the gen. Could there be a problem in the switch? Or am I still chasing wiring gremlins?

(quoted from post at 23:14:13 09/12/12) I have a 4010 jd with the 24 volt system and am having charging troubles. Motor tested the gen, checked the vr still getting no charge. New batteries, cables, new vr, new brushes in the gen. Could there be a problem in the switch? Or am I still chasing wiring gremlins?

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nly gen, VR, batteries are involved in charging, unless you base your no-charge assessment on gen light, where switch is involved.

Sorry, unlike the 12 volt system which is easier to troubleshoot, theres just so many wires and connections on your system its hard for me to troubleshoot over the net (heck its hard enough if there lol)

Like jmor noted the charing is across both the series batteries and it involves the genny and VR with an idiot light (which comes on via switch) and no relationship to frame ground, so if the VR is okay????????? that about leaves the genny, even if it has new brushes there could be other problems. i.e. I doubt the switch is the problem......

If the genny was off the tractor and worked with, I wonder if it could have gotten polarized at the wrong polarity?? You might try that (hope the new VR wasnt damaged by incorect genny polarity???) then see what happens.

I normally tell people to check grounds and connections but that rats nest of a 24 volt tractor makes that more difficult but theres no bad VR or genny frame grounds to worry with on your system.

Im not "certified" over 12 volts or on New Generation much, maybe Tx Jim who is more familiar with that tractor can help???

If the VR is new (but Ive seen bad ones out of the box) and the gennys is polarized but still no charge, Id be taking the genny to a shop for a test.

Sorry, Im not much good on new generation or 24 volt over the net....... Kinda like Dirty Harry (Clint Eastwood) said ..." A mans got to know his limitations"

John T

The 24 volt system works the same as the 12 volt with the exception that the cases of the components are not the ground circuit. Instead everything in the starting and charging system has a separate wire for the ground. On the generator the post on the bottom serves like the ground rather than the case like on the 12 volt system. On the starter the same thing happens. Instead of grounding the case, the cable connected to the side of the case acts like the ground would on the 12 volt system. Likewise the voltage regulator is not grounded to the tractor chassis but rather to the same circuit as the bottom stud on the generator. If you can keep it straight in your mind that the starter, generator, and regulator are all grounded by this circuit rather than through their cases you can trouble shoot them the same as the 12 volt system

John T
I didn't respond earlier because I never was good at diagnosing generator problems even though I understand a JD 24V electrical systems. This gets back to your "Clint Eastwood" comment. If the VR is good I to think the generator is the problem.

I wonder if jdv polarized the generator when he reattached the components??