Originally Posted by ATM
Always load test the battery with a proper load tester before performing any electrical diagnosis as Poltergeist stated. Battery cables need to be clean and tight. A tight battery clamp bolt does not always mean that the cable end is tight to the battery, make sure to perform the twist test after tightening the battery clamp bolts (that includes top post clamps), the cables should not move after tightening the bolts.
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1998 black 6 spd convertible