Power/Ground Outlet Provides a convenient electrical ground and power source from the vehicle. . Plug the tool into the cigarette lighter or power accessory receptacle. You now have a ground and power source on the dash. . The plug light will come on to signal the plug is properly connected and both power and ground are available at the posts. . For power, connect to the positive (+) terminal. . For electrical ground, attach ground wire from the instrument to be grounded to the negative (-) terminal. 32150 Yes -