Sparks do fly, the last connection on the cables is ground
to a metal , on engine not battery,
this will make a small, spark. all do, that. done right.
but if done backwards, a huge spark with the 2 batteries bucking each other, and damage will happen.!
yes you may blow the main fuses,
my guess you blew the 80amp fuse in the main fuse box under hood.
did you put the new battery in correctly Plus to PLUS
and NEG to NEG lugs, if not, BOOM AGAIN.
open hood,
fuse 1, if it ok, then the others fuse to the right blew.
when fuse 1 blows, all things die. zero power to anything in car
including head lights, (head lights are always the first check)
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