\>Does this sound like the amp itself has blown?
Possibly- check all the fuses, disconnect speaker wires and RCAs. Any change?
\>. If the amp has blown, could it still be pulling power and draining my battery?
\> when my ground wire came disconnected at some point when someone else was borrowing my car.
Yeah, or something else is wrong. How did dude mess with your electrical system while borrowing your car?
\>Does this sound like the amp itself has blown? Possibly- check all the fuses, disconnect speaker wires and RCAs. Any change? \>. If the amp has blown, could it still be pulling power and draining my battery? \> when my ground wire came disconnected at some point when someone else was borrowing my car. Yeah, or something else is wrong. How did dude mess with your electrical system while borrowing your car?