hey guys i have been trying to figure out why my fans are not coming on at all anymore...i have a code 77 which is the cooling fan relay control circuit. I have a new water pump, relatively new thermostat 180* the fans were working for a while after my header swap and now they have just stopped. i have switched the number 1 fan relay with another one but that has not done the trick. any ideas of where to start or test? i have been on shbox site also