The battery will check fine, and hold a charge, but does not have enough power (amps) to turn the motor over. Its got a dead cell in it. Blinkers flash, dash lights, and windshield wipers flop are sure signs of a bad battery.
Check and see what the volts are when it does crank. if you're seeing 10-12 on your DIC, then thats most likely the issue.
Check and see what the volts are when it does crank. if you're seeing 10-12 on your DIC, then thats most likely the issue.