If your Toro lawn mower battery keeps dying, the problem is usually the battery itself, especially if it will not hold a charge after being connected to a charger. A dead cell inside the battery is the most common cause of a lawn mower battery drains complaint. If the battery tests bad or will not stay charged, replace it first. Next, check the charger and the wall outlet with a multimeter to make sure the charger is putting out proper voltage and the outlet has not tripped a breaker. If the charger is good, move on to the alternator. On a riding mower battery will not stay charged complaint, a weak or failed alternator can leave the battery undercharged while the engine is running. After that, test the voltage regulator, which controls how much charging voltage reaches the battery. A bad voltage regulator can create a mower battery not charging condition even when the alternator is working. For the right Toro battery, charger, alternator, or voltage regulator for your exact machine, enter your model number on RepairClinic.com to match the correct replacement part.
01 - Toro 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.