Luna and Joe, thank you for your responses. Joe, that's why did didn't name you Nunamaker.
I checked the fuse and it's fine, so it must be something else. I'll start removing stuff from the trunk and making sure nothing's touching the speaker wires just to be safe...
I'm a bit concerned now because I recently took my car to one of those full-service car washes that sprays the interior with some scent, and I'm wondering if maybe they sprayed the floor too much and it got into the amp and shorted it out or something...does this sound plausible?
If this is the case, does anyone know anywhere beside a junk yard I could get this amp from? Otherwise I might just rewire everything......but that will be a huge pain.
Thanks again for your quick responses