I installed the head unti and it was al working fine but when i put the dash back on it wouldnt turn on. I made sure all the connections were fine and they were. I checked the fuse and it was blown so i replaced it but it still ownt work. The clock in my car is resetting everytime i turn my car off so im thinking that the battery wire for the head unti is connected to the clock and the connection to the battery isnt working. But the fuse is good. helllp?!?!?!?!?!