My 2004 grand prix cluster doesnt turn on, after driving for 5 min it will turn on and some times off again. There is no crank on 1st attempt on starting, turn the key off and it starts 2nd time. I changed ignition switch, battery and alt are good. The hot wire on the cluster harness gets 12.4 volts and the switched wire when i turn the key on is only 6.3 volts. All grounds are good. What else can i check? Thank you for help.