LAWN MOWER /TRACTOR / ZTR / HOW TO TEST SMALL ENGINE VOLTAGE REGULATOR/ RECTIFIERS



ITS A CAKE WALK TO TEST THE VOLTAGE REGULATOR ON A SMALL ENGINE….WATCH MM1 AS HE SHOWES YOU HOW

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23 thoughts on “LAWN MOWER /TRACTOR / ZTR / HOW TO TEST SMALL ENGINE VOLTAGE REGULATOR/ RECTIFIERS

  1. A friend of mine has a log splitter with a Kohler K241 it has a starter / generator with a voltage regulator. He is having some charging issues and his manual does not cover this set up. Do you have a wiring diagram or testing procedures for this type of charging system? Please reply to sptnurb@yahoo.com Thanks in advance

  2. Believe it or not there are ways to test these things without this high dollar tool..Im old school so yep this is useless to me.

  3. Various comments mention that this tester is stupid because you can just test the regulator with a multimeter. The answer is that you CANNOT easily bench test with a multimeter because the Kohler regulator/rectifier is more than just a simple 4 diode bridge. It also regulates! If you test the resistance between AC and B+ on a brand new unit, it will show 0 between one of the AC lugs and B+ and infinity between the other AC lug and B+. If you reverse polarity (switch lead on B+ from black to red or vice verse), you'll find the same readings, but on a real diode bridge changing the polarity would have flipped the reading from 0 to infinity or from infinity to 0 since the diode conducts in only one direction. Forget the multimeter diode test; it will make you mistakenly think every regulator/rectifier is blown.

  4. With a multimeter, ac voltage around 28 between the connectors from the flywheel, and 13+dc to the battery, while the engine is running. Bench test? No idea.

  5. I know this is an old post but I need to pick your brain I have a 1972 John Deere 112 with the Koehler engine and I keep burning up the voltage regulator rectifier last one lasted about 1 tank worth of fuel. The stator has no grounds has good continuity and at full throttle a steady 36 volts ac. Any ideas the voltage regulator is part number AM102596.

  6. I had one that read Short on my Kohler tester. I tried it three times and kept coming up that it had a short in it. lol. Then unit are between 175 and 230 dollars.

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  8. Hey I have a John Deere LT155 with a Kohler 15 HP engine .
    The two white wires coming from the stator are butt connected into one wire that goes to the voltage regulator mounted on the side of the flywheel cover and the other A/C wire goes to the ignition switch.
    The problem is that both A/C wires have gotten so hot that the insulation has melted near the voltage regulator connector and the white A/C wire going to the ignition switch got so hot it became brittle and fell apart.
    There is a 14 guage ground going from the voltage regulator to the engine block, do I need to find a better ground?
    I do not see any diodes .

  9. Correct me if I'm wrong but, on a Kawasaki the two terminals on the right are both AC and the single one on the left is the B+ so it goes B+ AC AC that's the way the plug from the stater comes out

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