@tyler you're looking at multiple different scenarios based on just the sound alone. It could be the voltage , it could be the vacuum , and it could obviously be the pump. The way to tell the easiest is to sit and complete silence. I mean midnight in the country complete silence . Turn your radio off and have your door shut with your window down. Reach in and just turn the key forward without actually starting it while you're standing outside of the vehicle. You should hear it click on and start pushing . As long as it's doing that you're good to go . If you have to crank on it for a while to start or you don't hear it immediately kick on then it's going out