Went out to start the Dart today, and got the dreaded "click".

Put the jumper cables on and let it charge off a running donor car for about 30 minutes. "Click"

Removed battery from the Dart and attached jumper cables from running donor car to Dart's stock cables. "Click"

Put battery back in the Dart, connected stock cables, checked battery voltage 13.5V, turn key to "start" position got the "click" and battery voltage dropped slightly, but did not go to zero.

Had trouble end of summer with a dead "right now" battery. Replaced the battery, and was good for the occasional outing (once or twice a week). Has been sitting for the last week and a half. Thought I should run it today and that is when my trouble started.

What is going on?