msd ALWAYS blames it on the ground to the battery thing. Friend of mine went through a bunch of trouble with a 7AL-3 box missing out at 6000 rpm in his dragster. Did this with no chip in rev limiter also. He sent it back twice both times they say it's fine. He got mad and purchased another one.Hooked it up to the same wires and it worked great. Put the box in my car and guess what...missed out at 6000 rpm. Put my box back in and hooked it up to the same wires and it worked fine