Truck has no power to any electric part except the radio. I have a 1997 Chevy Blazer, it will not start nor will the dash lights come on or any power to turn on any electronic part except the radio and lights. It will turn as it wants to start but will not start because there is no power to the fuel pump. I tested all fuses and breakers and traced the negative cables on the battery. I put a new battery in and it still wont start. What can I do next?