Alright ill try to make this as sort a possible. I have a 99 Pontiac Grand Prix GTP. With in the past 4 months off and on the radio will cut out and the windows will not work. I brought it to my mechanic twice. Each time the radio and windows would not work, but when he went to look at it they were working again and he cant figure out what is wrong. Any one have any ideas on whats causing this?