Short Stop Circuit Breaker?

[EastBayMitch]

While at work, I left my lights on and my battery went dead. I proceeded to get a jump from a friend, and without checking, he connected the cables to the wrong posts. I noticed a wisp of smoke and yelled, "NOOOO!"

Now my speakers don't work.

The stereo works, but I have an Audiovox amplifier connected in between the battery and stereo. This does not seem to be getting power. I think a hidden fuse or circuit breaker (?) might be the culprit. A short section of the amplifier's power wire goes from the positive battery post to a small square block (http://www.surplus-electronics-sales.com/Zencart/index.php?main_page=product_info&cPath=6&products_id=86) and then continues on into the passenger cabin where the amplifier is located.

Could this circuit breaker have been tripped when the car was incorrectly "jumped"? Should I just buy another one and see if that fixes it, or is it more likely that the amplifier has just been burned out? Thanks in advance for your help.

[esty]

i would try replacing the box you describe with an inline fuse, available at the corner parts store and see what happens...if you get it working that way, the fuse serves the same purpose