Small Engines (Lawn Mowers, etc.): Will not keep a charge., defective alternator, briggs stratton

Question
I have a 18 HP Briggs & Stratton model # 422777 and I have gone thru 2
batteries, and I was told that the starter was the same as the alternator but I
don't think that is true. Where is the alternator and is there anything else that
charges the battery.

Answer
Hello Jason,

The alternator is a crucial part of the electrical system in your small engine.  The alternator creates a moving magnetic field to induce current.  The alternator functions similarly to the generator on your old bicycle wheel, which continued to provide the electricity so you would have a light as long as your bike's  wheel kept turning [or the engine crankshaft] was revolving.

So, that being said, should your alternator malfunction, this could and usually does affect the functioning of your battery.  In the case of your auto, a defective alternator can result in a dead [completely shot] battery, and in a lot of cases you need to replace both.

The alternator should be attached [by wires] to the battery, but since I don't have a copy of your manual, I wouldn't be able to positively locate the alternator.  I would recommend contacting Briggs & Stratton.

Regards,
Howard