No power to my radio 1997 Ford Escort

It should be in the fuse box with all the other fuses or at the back of the radio,remove to gain access.

Often disconnecting the main battery for say 5 mins should do the trick without needing to find the fuse.

Chsnge the alternator, anything that blows a 100 amp fuse is a definate direct short to ground. Check for a loose or broken connection

Check battery cables are correct ! Prime suspect here ! Alternator may be damaged and shorting .. Don't drive any car that will melt jumper cables ! Something very basic wrong here.

Dirty connection at the battery post ?

apparently you cooked it along with the alternator.

youve got either a bad battery conection or a short between the battery and starter!!!11

SOUNDS LIKE YOU HAVE ARELAY GOING OUT!

Battery light is on and battery is not holding the charge because you have at lest one cell damaged
because of accidental short-circuits between the battery terminal. So most probably you need to get new one (in Sears starts from $49,99) For fuses location follow this link please
Good Luck
http://www.autozone.com/az/cds/en_us/0900823d/80/15/66/b3/0900823d801566b3/repairInfoPages.htm

Check all the large main fuses, one of these usually burns out in a reverse jump, that is most likely the problem. The fuse you need to check is fuse 1 and fuse 7 (both are maxi 40 AMP) in the the under the hood fuse box, also check fuse 9, this is the computer fuse, it is under the hood also.