Andy, You should be pretty good with an ohm meter. Measure from the neg. battery post to anywhere on the chassis or frame. If it's more than .1volt dc drop, then you need to work on your ground cables and connection. That is a typical voltage drop. Naturally connecting direct to the battery ( - ) would eliminate and other drops. Computer equipment should be less than .05 or less. John Hervey www.specialTauto.com << i have read from many sources that the best place to ground high power stereo equipment is to ground it directly to the ground connector on the battery rather than the frame. if you ground all of your equipment with a distribution block and have only one heavy gauge cable going to the battery, this will eliminate ground loop interference. i have NEVER seen anything grounded to a car battery before - is this really a good idea? i should think it would be OK but I'm not sure! any ideas? >>