If your Simplicity lawn mower battery keeps dying, the battery itself is the first thing to suspect. A bad battery can have one or more dead cells, so even after charging with a charger, it still will not hold a charge. If the battery checks out, move to the charger and verify it is putting out the correct voltage with a multimeter, and make sure the outlet has power and has not tripped a breaker. When a riding mower battery will not stay charged during normal use, the next likely cause is the alternator, which should supply voltage while the engine is running and recharge the battery at the same time. If alternator output is low, the mower battery not charging problem can also point to a failed voltage regulator, which controls how much charging voltage reaches the battery. This kind of riding lawn mower charging problem often shows up as a lawn mower battery drains quickly between uses or goes dead after mowing. Enter your Simplicity model number on RepairClinic.com to find the exact replacement battery, charger, alternator, or voltage regulator that fits your mower.
01 - Simplicity 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.