I am installing a couple 4 inch cube led lights under the front bumper of my Jeep Cherokee. They seem to flicker a little when they are on with the Jeep running. When I turn the lights on with the Jeep not running the passenger side light does not light at all. The light brackets are solidly mounted to the metal bumper and the system is securely grounded. Also the power wire is securely attached to the battery. Any idea what I am missing?