Try a different BOX!!! A friend had a 7AL3 that did that and they kept saying there was nothing wrong...we put it in my car and it did the exact same thing...hooked to the same wires as my box was hooked to. He got mad and bought a new box and the problem was solved. Hooked it to the same wires the other was hooked to. That was 7 years ago still no problems...it was a bad box...don't care what MSD said.