If your Snapper lawn mower battery keeps dying, start with the battery itself, since a dead cell is the most common cause. Try charging it with a charger first. If the battery still will not hold a charge, it needs to be replaced. If the battery checks out, the next likely problem is the charger, so test its voltage output with a multimeter and make sure the wall outlet has power and has not tripped a breaker. A Snapper riding mower battery will not stay charged if the alternator is not producing enough voltage while the engine runs, so that is the next part to test using the wiring diagram for your model. After that, check the voltage regulator, which controls how much charging voltage reaches the battery. If the regulator fails, the lawn mower battery drains quickly and you end up with a mower battery not charging even though the engine runs. For any Snapper lawn mower charging problem, enter your model number on RepairClinic.com to find the exact replacement battery, charger, alternator, or voltage regulator that fits your mower.
01 - Snapper Lawn Mower Battery
One or more cells in the battery may be dead. Try charging the battery with a battery charger. If the battery still won't hold a charge, this indicates that the battery is defective and will need to be replaced.
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To determine if the charger is defective, use a multimeter to test the charger for proper voltage output. In addition, test the outlet used by the charger, and ensure that the outlet has not tripped a breaker.
The alternator provides voltage to the lawn mower while the engine is running and also recharges the battery. To determine if the alternator is defective, use a multimeter to test the alternator voltage output according to the wiring diagram.
While the engine is running, the voltage regulator sends the proper amount of voltage from the alternator to the battery to keep the battery charged. If the voltage regulator is defective, the battery won't receive enough voltage, causing the battery to drain quickly.