Andy: The best ground is to the power source itself, which is the battery. There is no substitute for a good ground and the battery's terminal is the best point. The frame and all other "attached" components which is to be used as a grounding point, will in time have some resistance due to corrosion and the dissimilar metals will enhance this process. Just make sure that your ground wire, as your "supply wire," are the correct gauge for the "said" equipment and don't forget to use a heavier gauge for the longer "running length." Also make sure all the terminals and hold screws downs are tight, for they do losing up through time by vibration and heat which will cause arcing. FYI..... High power audio amps with the inadequate thinner gauge wire will suffer power lose, besides dangerous wire melt down. Thinner gauge wire result in degradation of sound, especially in the low bass frequencies and the high end "sweetness" if the amp is capable of delivering it. You don't want to "wire for fire" or to "learn by burn." Kayo Ong #5508 Lic 9D NY [Non-text portions of this message have been removed]