LT133 Regulator testing
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    LT133 Regulator testing

    So I bought a new regulator after blowing up the last one I bought. I thought I would ohm out the connections as described in the service manual just to see what I'd get. I'm not getting the values indicated in the manual. Could it be that the newer regulators cannot be tested in this manner?

    Here's the chart from the page in the service manual:

    Click image for larger version. 

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    Thanks for any advice on this.

    BTW the regulator is a Kohler 4140310-S.

    John Deere P/N is MIA11665. Maybe the MIA stands for "missing in action"?

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    DaBomb6988's Avatar
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    Is the regulator mounted on the tractor? Having it grounded to the chassis may adjust the values. Also how far out of spec is it?
    John Deere Current: X540, 425, GX345, GT262,
    2520-FEL,

    Sold: 650-FEL, MMM, BrushHog, GT235, LX172

    Ford: LS45 Work in progress fire damage

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    Quote Originally Posted by DaBomb6988 View Post
    Is the regulator mounted on the tractor? Having it grounded to the chassis may adjust the values. Also how far out of spec is it?
    Thanks for your reply.

    New regulator is mounted to the plastic housing with body of regulator tied to ground (and terminal wires disconnected of course).

    Here are the results of my testing:
    Click image for larger version. 

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    The results for the new and old regulator do not match the values shown in the service manual. Not even close in some cases. Even if there were a misprint in the manual, it would not seem to correlate. My test meter is an old B&K so there's a chance that it's faulty but I tested a few random resistors that I have lying around (values from ohms to megohms) the meter seems to have read them properly.

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