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I've got an electrical issue. I can jump start it easily, but the battery isn't getting charged as the mower runs. If I charge the battery, it retains a charge. The last time I used it, it started without help, but an hour later when I stopped to fill the gas tank, it was dead and needed to be jumped. I don't know if I have a loose electrical cable somewhere, a short, or if the generator / alternator is faulty. I have been unable to locate the name, part number or location of the generator / alternator in a diagram, but I think I know the device on my tractor, just need confirmation. Are my symptoms familiar to anyone? Any suggestions for isolating the issue?

Charging system parts are part of the engine. Post the engine numbers and we’ll find you a service procedure to test the charging system.

Thank you. It's a Briggs and Stratton 31p977 I've found the replacement alternator but not the voltage regulator yet, nor even it's part number. I'm hoping that will solve my problem.

Thank you.

31p977 0635 e1 0604 21ze

I was beginning to doubt this motor has a voltage regulator. So, does that likely point to the alternator?

Check out the section on governors in this manual. You should be able to identify whi charging system by the wires you have.

Thank you, but if there's anything that's useful to my situation, I wouldn't know how to begin to find it. I'm not good at riddles. There are literally 101 pages in that pdf.

Try this alternator ID chart. Should be a lot easier. Take a look at the dual circuit wiring and yes can have a regulator but that is not usually worth the extra expense for a couple amps more current.

Brigg Alternator ID Chart