Overcharging issue

vista2016 · Aug 12, 2016

In the process of redoing the Vista, I installed a new alternator and regulator since the originals tested bad.
The alternator is a 10DN and the regulator looks to be a GM style with, F, 2, 3, 4 pins.
I rewired everything since the old harness was in bad shape. I reused the voltage regulator plug. Everything is wired per the wiring diagram in the manual.
Started the tractor and it would not charge. I started searching 10DN wiring diagrams and found that I needed to swap the wire from pin 2 to pin 3 on the voltage regulator plug. Now the tractor is charging, but it's charging a full 30A.
Yes the battery is good, it's brand new.
All the diagrams I see show a 4th wire going from the regulator to the "R" terminal on the alternator, however my voltage regulator plug only had 3 wires on it and the wiring diagram only shows 3 wires.
What am I missing here that's causing it to constantly be in full charge? I did read to check the grounds so I'm going to do that.

MMG1050 · Aug 13, 2016

Are you sure that is does not need to be on the F (field) side of the
alternator?

vista2016 · Aug 14, 2016

I have a wire going from F on regulator to F on alternator. Wire on pin 3 of regulator to battery positive. Wire on pin 4 of regulator to ignition switch. Wire from battery terminal of alternator to ammeter.

Bob · Aug 14, 2016

That's a real odd way to connect up a 10DN, as the wire to the #3 terminal would never carry current, and it would not be able to charge at full amperage without a connection from "R" on the alternator to #2 on the regulator as the field relay would never pull in bypassing the low charge rate resistor inside the regulator.

But it should NOT be able to overcharge.

Either the regulator is "bad" or it's not properly grounded.

<img src = "https://photos.yesterdaystractors.com/gallery/community/c3719_lrg.jpg">

ONE way to wire a 10DN and regulator.

vista2016 · Aug 15, 2016

Thanks Bob.
I'll put a wire from #2 on reg. to R on alternator tonight and check the ground. Regulator is new (granted it could still be faulty). I'm just surprised that the "replacement" regulator for the tractor didn't come with something saying "Hey you need to switch this wire and add this one to make it work"
Oh well, it's a simple circuit so I'll get it figured out eventually.
I found the diagram you posted, and I also found the one below. It's the only one I could find that had the ammeter in circuit. Notice how it's wired slightly different.

Overcharging issue

vista2016

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Bob

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