Generally,the current on the cathode of the car comes back to the battery cathode through the electric appliances. As all know,the car body is made of steel,so the original current loop design can produce impedance,causing circumstance not smooth or lost and affecting seriously on the electrical appliances. Therefore,connecting the electrical applicances and the car body directly together cathode of the battery with the high-performance enforced ground wire can greatly improve the circumfluence and the top choice to improve the performance of the car electrical appliances!