Originally Posted by
S. Artee
Not sure what kind of nominal voltage runs to the pump, but since it's not an "always on" circuit, perhaps wiring up an LED to the connector would be a simple start?
You're correct that the pump is not always on, but if I remember correctly, once it turns on it will run until the car is shut off. I think Woody (waldig) has a You Tube video that shows this ... by using LEDs to show when it's on and when it's off. So, what Jesse suggests would turn the pump on and it will stay running until the car is turned off.