I just swapped out my old Rockford amp 400, with a Pioneer GM-A6704 4 channel amp. Should have been a pretty simple swap. Have all my speakers wired into amp wired correctly, regrounded both amps to bare metal, connected my remote wire which is Y off to both amps, have 4awg amp wire ran to a T and 8" evenly to both amps, my sub amp is working great. It's my new Pioneer amp not working, IT me on force 3 seconds and shut down, I checked both fuses both operating ok. I have voltage up to amp and even checked fuse size with test light hv power at both test points when plugged in. I do not have the power light but hv voltage to fuses didn't make sense to me. I am afraid to open amp being its brand new and might void warrant. Might have that marking stuff on it somewhere. My sub works great, don't k ow what happened and why amp shut down. HV a Kenwood 9990hd, 2-front 6x9 PIoneer 5 ways, in back door Rockford Fosgate 6 1/2" T16's, 3-3 1/2" rounds in my factory dash spots. System Been doing great for last 3 years. Speaker amp lost a. Handel that's why I replaced it. Such a simple swap but I can see this is going to be a pain. Hate to hv to take to a stereo house they usually just get into my pocket. Any help would be greatly appreciated thanks again