If your Exmark lawn mower battery keeps dying, start with the battery itself, since a dead cell is the most common reason the mower battery will not stay charged. Try charging it with a charger first. If it still will not hold a charge, replace the battery. If the battery checks out, move to the charger and verify it has proper voltage output with a multimeter, and make sure the outlet has power and has not tripped a breaker. When the engine is running, an alternator problem is the next likely cause, because the alternator is what supplies voltage to the mower and recharges the battery. A bad voltage regulator can also cause a riding lawn mower charging problem by preventing the battery from getting enough voltage, which leads to a lawn mower battery drains complaint even after charging. For an Exmark riding mower battery will not stay charged issue, these four parts are the key places to check in order. Enter your model number on RepairClinic.com to find the exact Exmark replacement battery, charger, alternator, or voltage regulator that fits your specific lawn mower.
01 - Exmark 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.
Enter model number to search for the required part specific to your product
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.