A grounding kit well grounds your whole care out. The negative side of your battery goes to your frame. Completing the circut. A grounding kit runs wires from various places to a common point (or you can daisy chain one on top of another) to get a common ground. Lowering you ressistance to ground will allow your electronics to work properly. Just to put things in perspective...(do not try) but you can hang from a high voltage power line with your hands and be fine. You have all the power yes but until you touch ground or a tower you will not complete the circut, therefore the power is useless. You car already has a stock kit. I upgraded mine and the engine idled smoother and the headlights do not dim like christmas tree bulbs when the subs hit. I can get pics if interested.