Question

I own a 2006 corvette convertible. I am having electical problems. I go to start the car, the dash lights up but when pushing the brake and the push button starter, the dash goes dead (blacks out for 8-10 seconds). The starter does not engage and it will not start. The battery is fully charged and all dash, lights and radio work fine. This happend 2 weeks ago. I had it towed to the dealer. The dealer saw the problem but could not diagnose the problem as it went away and appeared intermittent. He had it 4 days and could not get the problem to come back. I picked up the car and drove it 3 days. Today, it is sitting in the garage again and won't start. I have checked and fuses and relays which appear to be good. About 1 year ago, I had a similar problem and they changed the batter due a defective cell.   Today, the batter reads ok. Help would be appreciated as I am getting frustrated.