A water pump capacitor helps the water pump turn and the electric water pump dynamo gain more power. It wears out over time and can't work as well when broken. Signs of a broken capacitor include weak pump thrust, the pump not turning, and not being able to hold electricity. Weak pump thrust happens when the dynamo doesn't get as much power as it did before. The pump won't turn because the dynamo isn't turning steadily enough for the capacitor to work correctly. The capacitor helps the dynamo turn by keeping the current it needs to keep riding. If the capacitor can't store electricity, it's another sign that it's broken. To measure a water pump capacitor with an analog multimeter, provide the instrument, set the selector to the Ohm-meter position, and make sure the multimeter is in good shape.