Toyota Repair: MY 99 COROLLA WONT START, routine check ups, amp fuse

Question
MY 99 AUTOMATIC COROLLA WON'T START. I WENT TO REPLACE THE BATTERY AND THE PARTS STORE GAVE ME A BATTERY AND THE POSITIVE & NEGATIVE WERE SWITCH(WRONG TYPE FOR MY CAR). I HAD SOMEONE LOOK @ IT AND THEY THOUGHT THE SURGE FROM THE WRONG BATTERY CAUSED MY IGNITION COILS TO BURN OUT. I HAD THOSE REPLACED AND IT STILL IS NOT STARTING IT MAKES THE SOUND LIKE IT ABOUT TO START BUT IT DOES'NT. I HAD IT TOWED TO A MECHANIC AND HE'S STUMPED. COULD IT BE THE COMPUTER CHIP. THE CAR IS WELL MAINTAINED ROUTINE CHECK-UPS OIL CHANGES. IT HAS ABOUT 180,000 MILES. I REALLY AND DESPERATELY NEED MY CAR FIXED AND DO NOT HAVE THE CURRENT MEANS TO BUY A NEW CAR. I LOVE THAT CAR. THE GAS MILEAGE IS GREAT! PLEASE HELP ME OH I ALMOST FORGOT IT ALSO AFTER THE WRONG BATTERY WAS IN, BLEW SEVERAL BLUE 15A FUSES WHICH WE REPLACED TWICE THIS PAST WEEK, SPARK PLUGS WERE BLOWN AS WELL. THANK YOU SO MUCH IN YOUR HELP IN THIS MATTER.

SINCERLY,

ERICA WHITE
A TOYOTA LOVER  

Answer
When a battery is connected backwards there are some fuses that will go out but besides the small fuses there is also an alternator fuse, this is a 80-100 amp fuse and is located under the hood in the black fuse box, it is much bigger than the normal fuses, check to see if this fuse is intact, if not the first step is to replace it but it's not that easy because it is bolted in from underneath, the fuse holder can be released from the fuse box by releasing the retaining clips, once the holder is out the fuse can be unbolted and replaced.