hi folks please is there someone out there that can diagnose this problem on my friends 2002 gtx 4 tech from cold starts fine run for 15 mins and try to restart and it will not start when you hit the start button the dash goes blank and its as if the battery is dead heres the twist all conectiions ok battery fully charged took into dealers and had it put on the computor and they could not find any fault codes PLEASE HELP THIS IS DRIVING ME MAD THANKS