Scotty Kilmer, mechanic for the last 45 years, shows how to use a simple volt meter to find the source or strange electrical problems in your car. Often bad ground wires cause cars to do weird electrical things like making the parking lights come on when you step on the brakes. And once you know how to test ground wires, it's simple to fix such problems.And , If you like my car help, be sure to watch my live car talk show every Saturday morning at 10 AM CST on YouTube. I answer your car questions LIVE there. Just check it out at https://www.youtube.com/watch?v=Vognj... . And remember, every TUESDAY I upload a new video, so don’t miss them.