I have done everything I can think of to test this gauge to find out why it indicates that it is discharging when the tractor is running. It seems like the battery is charging because the voltage on the battery goes up from 6.3 to 7+ when the tractor is running. Yet the gage indicates just a slight discharge while running. When I turn the lights on it really goes minus. But the tractor runs, starts, and even continues to run if I disconnect battery while it is running. Is this, or should this, be a concern of mine? Why does it indicate discharge when the tractor is running? :x