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Q:

installed battery backward engine not firing what can i do to fix this
on 1999 Buick LeSabre

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
A friend said to try turning ignition switch 3 times then try starting vehicle. I tried that and it did not work.
(1) Answer
Assuming the battery is now installed properly , replace blown fuse(s) , main(maybe 100amp) and possibly others. Follow pos. battery cable to underhood fusebox(may be labeled 'power distibution') main should be closest to cable hook-up at box.