If your Weed Eater lawn mower battery keeps dying, start with the battery itself, since a dead cell is the most common reason a lawn mower battery drains or a riding mower battery will not stay charged. Try charging it with a battery charger first. If it still will not hold a charge, replace the battery. If the battery checks out, the next likely issue is the charger, so test its voltage output with a multimeter and make sure the outlet has power and has not tripped a breaker. A Weed Eater riding lawn mower charging problem can also come from 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 battery will keep going dead. The voltage regulator is another common cause because it controls how much charging voltage reaches the battery, and a failed regulator can lead to a mower battery not charging properly. Enter your model number on RepairClinic.com to find the exact Weed Eater battery, charger, alternator, voltage regulator, or other replacement part that fits your mower.
01 - Weed Eater 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.