I just installed a Kicker DXA500.1 amp in my car, and all it does is go into protect mode when I turn on the ignition. It does this even with the subwoofer and RCA input disconnected. I have double-checked all connections, and everything looks good. I am not in the car audio business or anything, but I have installed a handful of amps before and never had an issue - pretty confident I haven't done anything wrong here. I have used 4 gauge cable per Kicker recommendation, the positive and ground connections are tight, the amp is not touching the chassis, etc. The ground connection I am using is the same connection that the car battery uses. I am at this point assuming I have a defective amp. What could I be missing here?
So, I ended up removing the power and ground cables from the amp and battery, swapping out the fuse (why not?), re-installing everything, and...it works!!! No idea what the issue was, as the fuse I removed looked just fine and everything else is the same.
Now my problem is figuring out how to keep the trunk lid from sounding like it is going to fly off.