No power to the heater & a/c control head worked fine this morning when i went to work when i came back out to my truck my truck wouldn't start. notice loose battery terminal. But then i noticed my controls for heater weren't working check fused it was fine what do you think this problem is, is this common?? is the control head hooped please help!?!?!?!

 

Did your truck start after you tightened your battery cable? Did you have to jump start the truck?