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Swapping 4 Terminal Voltage Regulator For 3 Terminal?


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#1 Brando OFFLINE  

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Posted January 14, 2013 - 03:26 PM

i picked up a cub cadet 70 that was wired up with out the voltage regulator, but everything worked. The manual calls for a 4 terminal vr. I dont have any 4 terminals but plenty of good 3 terminals, can i use the 3 terminal instead? i read that the terminal on the back of the 3 terminal is for the generator?



#2 WNYTractorTinkerer ONLINE  

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Posted January 14, 2013 - 04:02 PM

As long as you know where the AC leads go on and the DC output hooks in!


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#3 Brando OFFLINE  

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Posted January 14, 2013 - 05:22 PM

As long as you know where the AC leads go on and the DC output hooks in

 

 

Im not 100% certain. this is my first time getting a a tractor with out a vr or one that doesnt work, I guess i have lucky so far. Electrical is not my best attribute.



#4 Farmlife OFFLINE  

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Posted January 14, 2013 - 05:36 PM

If I were you, I would ask Casey... (wvbuzzmaster) he has a degree in electrical something...lol (sorry Case), but he's very knowledgeable with these things...


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#5 glgrumpy OFFLINE  

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Posted January 14, 2013 - 06:26 PM

Older cubs with starter/gen have diff regulators. More like used on older cars that had gens. Modern small engines make their own power (most) with stators under flywheel. Those produce AC 36 volt or so, and then a rectifier changes that to 12volt DC.  Would think you would need to re-wire that whole charge system and use correct parts as needed. Taking  start/gen off would need a diff engine equipped with it's own gen under flywheel then, to run w/out start/gen, AND also need a starter drive and system to replace that action also.  Is this what is happening, an engine change?


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#6 HankS OFFLINE  

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Posted January 14, 2013 - 06:58 PM

The terminal on the back is the output from the generator. On the front you have a terminal for the field windings on the gen, one for the battery connection and one for the loads, lights, ignition, etc. So all current from gen to the battery for charging and loads goes through the VR. Also all current from the battery to loads, except starter, goes through the VR. There is over current protection built into the VR. Don't recall if it's meant to protect the gen or the whole system.


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#7 Amigatec OFFLINE  

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Posted January 14, 2013 - 07:47 PM

Yes they will interchange if wired correctly. L=Load G=A term on S/G B=Batt F=F term on S/G Some will have a Grd term instead of a L term. I use a 4 term on my Cub 129 and don't use the L term. Just G, B, and F.
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#8 WNYTractorTinkerer ONLINE  

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Posted January 14, 2013 - 08:02 PM

So the question is this-  What exactly are we dealing with here??

 

A starter generator which is external to the engine?

 

A Stator coil under the flywheel? (They will generate ~30V AC @ WOT)  The regulator drops one side of the AC and converts it to DC ~14Volts to charge your battery.  

 

What Make or type of engine does the thing have?  B&S?   Kohler?  Or another manufacturer??  

 

If it's still stock a S/G will be the answer but it's hard to discern over the internet???  (BTW Amigatec's method is right if so)



#9 Amigatec OFFLINE  

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Posted January 14, 2013 - 08:09 PM

A CC 70 would have a 7 HP Kohler with a S/G.
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#10 WNYTractorTinkerer ONLINE  

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Posted January 14, 2013 - 08:21 PM

A CC 70 would have a 7 HP Kohler with a S/G.

It may have been swapped out with something else is all I'm saying..  Just wanted to clarify that point..  Thanks!



#11 Brando OFFLINE  

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Posted January 15, 2013 - 10:16 AM

Thaks everyon. HankS and Amigatec answered my question ands its a 10hp Kohler that was swapped years ago by PO, it has a starter generator.


Edited by NCtractorman83, January 15, 2013 - 10:21 AM.


#12 Brando OFFLINE  

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Posted January 16, 2013 - 07:06 PM

Got it wired up and took it for a ride in between showers. Almost done with the resto.

Attached Thumbnails

  • IMAG0707.jpg


#13 WNYTractorTinkerer ONLINE  

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Posted January 16, 2013 - 07:46 PM

Looks nice!!


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