It's probably working the way it is supposed to. Mine never shuts off the motor during our winters. In the summer when it is working, if I want it to keep working I need to pub a trickle charger on the battery every 10 days or so. I like it on account of the better fuel mileage when it is working, and I'm not so quick on the gas that I have to wait for the engine to turn back on. By the time my foot is on the gas pedal the engine is running.