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Briggs and Stratton 20hp Intek Twin V OHV engine is not charging the battery on my John Deere L120 mower I have a good digital multimeter. how do I check to see what is wrong or do I just replace "the alternator" Where is it? Is it easy to replace. It also has a regulator. What does that do?

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Here are the alternator wiring diagrams for Briggs and Stratton Engines:

Most alternators have an AC output but others that have an in line diode will have an AC reading BEFORE the diode and a DC reading AFTER the diode.

If you going to check alternator coil resistance you must check resistance before the outgoing in line diode connection (alternator side.)

When you check a diode you will read ZERO resistance with the meter leads in one direction but infinity when the leads are reversed probing the same two test points. Any other resistance reading = bad diode.

You may have an AC output and a bad diode from your alternator. Check the resistance of the alternator stator winding on the alternator side of the diode. You should get a reading under 500 Ohms. If you get infinty the alternator has failed.

Posted on Apr 11, 2011


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