Small Engines (Lawn Mowers, etc.): Briggs Twin 12.5, dual circuit, battery model

Question
 Battery will not stay charged. There is no drain on the battery. Model 404437  Type 1210-01  code 89111012
                       Thanks for your help,
                                        Kenneth

Answer
Kenneth
Sounds like your alternator is bad you will have to replace it Let me know how many wires are coming out of the alt

It has to be one of these
Stator, Alternator (Dual-Circuit)

Stator, Alternator (Tri Circuit, 9Amp Regulated)

(10, 13, or 16 Amp-Depending on Size of Flywheel Magnets) (Regulated)
This last one is DC Only and it may be it depending on what equipment it is on.,