I've got the same blinker problem as i have read about a dozen times, all outside blikers work fine all the time but when you turn the dash lights on the inside blinker indicators stay on and can be dimmed with the headlight switch. Disconnecting the front blinkers turns off the indicators. Cutting the blue wires for the blinkers also turns of the indicators. I've also tried to replace every piece in the blinker circuit from another chevelle that everything works on. No change. And checking all my grounds, including the blinker bulbs. I'm at my witts end with this. I really think it is a ground but i just can't find it. Any suggestions?