1996 Mazda Protégé, 129,000 miles. Tested out the car battery today using a new handy dandy Innova 3721 Battery Monitor. 11.40 v(red) when not running, 14.40v when running. The directions say even if there is low voltage, the battery may not be dead, check for loose cables, clean terminals or charge the battery. Walmart Everstart 35N Maxx battery installed in late fall, 2011.
Where are the loose cables that I might check? I know where the terminals are and how to clean them.
I am guessing I need to replace this battery?