38 STX Charging Problem

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Old 08-07-06, 05:05 PM
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38 STX Charging Problem

I have a 38 stx. I'm having a charging problem. Can anyone help me with the specs and procedure on checking the regulator? Any thoughts on anything else to check would be appreciated.
 
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Old 08-07-06, 06:16 PM
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Do you have an AC/DC voltmeter? If so, on the regulator there are 3 terminals. With the engine running full speed, and the connector off the regulator, check for AC voltage on the 2 outside terminals on the connector. If you have voltage there, plug it onto the regulator and check for DC voltage on the middle terminal. You should have around 13.5 volts. Let us know the results, and we can go further if needed.
 
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Old 08-08-06, 05:42 AM
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I will check that out. Thanks for the help.
 
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Old 08-09-06, 10:11 AM
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I checked the voltage and on the outside terminals it was 17 to 18 VAC. Plugged in there was no DC voltage on the middle terminal. I assume this means a bad regulator? If not what should I check next. Thanks
 
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Old 08-09-06, 10:09 PM
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Sounds like the regulator is bad.
 
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Old 08-10-06, 02:46 PM
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Post back with the engines' ID numbers and we'll provide the part number of the regulator you will need to buy.
 
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Old 08-10-06, 05:58 PM
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The engine numbers are:
Mod. CV12 5S
Spec. 1270
Serial 2401118538

Thanks
 
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Old 08-28-06, 02:26 PM
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I purchased a new regulator from our JD dealer. After putting it on and running the tractor a few times I have a dead battery. I rechecked the regulator using the above method and the results were the same. Could there be another cause of no power coming out of the regulator? Or could this be a bad regulator? Thanks for all your help.
 
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Old 08-28-06, 08:23 PM
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You still have AC voltage on the two outer legs? Did you check for DC on the center leg when you installed the new one? Unplug the connector and check for battery voltage at the middle terminal. If none, the charge wire may not even be connected to a source of battery power.
 
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