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Garden Tractors Discussion Forum

Allis Rectifier/Regulator continues

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IA Roy

09-22-2007 11:02:01




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This morning I took a wire wheel to the aluminum heat sink on the assembly and made it shiny. I had already cleaned up the electrical terminals. I clamped it to the frame and used a gator clip and wire to make sure there was a good ground to the battery. Still no output on the B+ terminal. I took my Ohm Meter and checked for contunity with the red positive lead of the meter on one of the AC terminals and the black negative lead on the B+ terminal. There was continuity between one of the AC terminals and the B+ but not on the other one on that regulator. I got the same results on the other Rectifier/Regulator. If I am thinking correctly there should be power going from the AC terminals to the B+ terminals, but not the other direction due to the Diodes that make up the rectifier. Educate me if I am wrong.

Thanks for your time and interest in advance!

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Kentb of SWMO

09-23-2007 14:14:22




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 Re: Allis Rectifier/Regulator continues in reply to IA Roy, 09-22-2007 11:02:01  
There is more in the box than diodes. I learned something this spring about the three terminal voltage regulator. I rebuilt a guys K341 in which he had broke a crank and damaged the flywheel and stator. I checked the stator for shorts to ground and did not find any BEFORE I mounted the stator. When I put the engine in the 300 series JD and hooked the battery up the fuse popped. In checking things out I found the stator was SHORTED to ground. The slight movment of the lamination were bolted down made the short appear. Of course, I had to pull the engine to replace the stator. I check with the new stator with everything connected right, you will have 12 volts on all three of the regulator terminals without the engine running. As to you no charge problems, Replace the regulator. Kent

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Bob

09-23-2007 01:33:37




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 Re: Allis Rectifier/Regulator continues in reply to IA Roy, 09-22-2007 11:02:01  
With the engine STOPPED, and the harness disconnected from the regulator, check between the AC leads from the stator with and Ohmmeter.

One of the leads could have damage, or a poor connection somewhere, passing enough current to make your Voltmeter read 40 VAC, but NOT enough current to produce DC sthough the regulator/rectifier.

OH YEAH... have you checked the AC voltage across the stator leads WITH them plugged into the regulator, or "open circuit", with them unplugged?

Another thing... do you have a lead from the output of the rectifier/regulator to a 12-Volt battery, or are you looking for DC output voltage from the regulator with it's OUTPUT "open circuit"?

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IA Roy

09-22-2007 20:26:49




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 Re: Allis Rectifier/Regulator continues in reply to IA Roy, 09-22-2007 11:02:01  
The rectifier/regulator seems to be wired the same. At full throttle I had about 40 volts.



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El Toro

09-22-2007 16:03:49




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 Re: Allis Rectifier/Regulator continues in reply to IA Roy, 09-22-2007 11:02:01  
third party image

Is your rectifier wired as shown in this diagram?
If you have AC voltage from your stator 30 volts or so you could have a bad rectifier. Could be a popped diode. Hal



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