Craftsman LT3000 (model 917276813)

[MCMDave]

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?

 

[Rivets]

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.

 

[MCMDave]

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.

 

[StarTech]

Owners manual indicates you got a 31P977-0635-E1. Please verify type number as the ipl of the one listed indicates only a dual circuit alternator; therefore no voltage regulator. You need a tri-circuit or larger stator to have a voltage regulator.

 

[MCMDave]

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?

 

[Rivets]

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

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[MCMDave]

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.

 

[StarTech]

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