The ground is fine as far as I can tell. I'm determining that based on the fact that my previous amp worked great, no heat ups or anything like that, aside from its own internal problems. Also, the Remote On from the head produces nice little sparks off of the ground.
The only thing I can think of and what I have heard is that the fuse is bad (and some minor current is passing as someone here mentioned) or possibly there is some corrosion preventing serious flow, although my battery terminals seem clean enough, I will check this out.