http://www.youtube.com/watch?v=XhRPLgH6uZg What you need to do is perform a voltage drop test to test your starting circuit. Like the video says,you have to start with a known good battery.Just remember----the test alone at pos. term. on battery involves 4 tests----lug on battery for base voltage,fastener,eyelet on cable and cable itself. do this at every connection. When finished,do the same test on the neg. side. hope this helps. http://www.youtube.com/watch?v=yV5wdGtP34o Some good info on this vid also.