1950 Case S battery hook up.

breimer · Jun 11, 2019

Can someone tell me if a 1950 Case S has a positive ground electrical system? I m trying to diagnose it not charging and the way it behaved I m beginning to wonder if the battery is hooked up backwards

John Saeli · Jun 11, 2019

Negative Ground.

fixerupper · Jun 11, 2019

As you probably know most old tractors are positive ground but the SC is negative. Makes life interesting for the old tractor fans.

breimer · Jun 12, 2019

I ve tryed several things. It simply doesn t charge so I took the cover off the regulator and manually pushed the contact that was open. When I do that it actually discharges. This was making me think the polarity might be backwards. How about polarizing the generator? I ve never done that before but if someone previously has hooked it up wrong is that likely? I just bought this tractor so I don t know.

rgorange · Jun 12, 2019

Is it possible that someone hooked up the gauge backwards and it actually is charging when you close the contacts?

breimer · Jun 12, 2019

No I checked with a volt meter and the volts actually start to drop when I do that.

kevinthefixer · Jun 12, 2019

Tractor off. Take a jumper cable from battery positive to generator armature post (the heavier wire to the gen). Count three, remove jumper, should see a spark. Start tractor and check charging. If no spark chances are your generator brushes aren't making good contact with the armature. If still not charging, take your jumper and connect from ground to field terminal (small wire to gen). If it starts charging it's likely a regulator problem. Note you may not charge unless RPM is over 1000 or 1200. These are simple field tests, if this doesn't do it find a pro or do a LOT of homework, you'll save money in the long run that way and nobody gets hurt.

breimer · Jun 14, 2019

thank you. It s just that this one has the regulator right on top of generator and there s only one wire there. It goes to starter switch terminal which is battery positive. The other wires are attached under the regulator.

kevinthefixer · Jun 14, 2019

That's what happens when I give general advice for a specific problem. I'd have to see at least a wiring diagram to make any sense in that case, or the unit itself so I could make one, which of course isn't likely to happen. But if your volts drop when you close the cutoff contacts, it's likely draining power through the brushes, so they must be making contact. So either the regulator isn't completing the field circuit that supplies a magnetic field for the armature to move through, or the field windings or wiring to them or both are bad.

breimer · Jun 18, 2019

Thank you for your help.

1950 Case S battery hook up.

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