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You probably fried the ignition coil. They don't like having +12v on the ground side. And you may mess up the charging system too.

Check for blown fuse, also using 12v test light start at battery working your way to starter. How long time wise was it before you realized cables were on wrong?

mechanic mark said:

Check for blown fuse, also using 12v test light start at battery working your way to starter. How long time wise was it before you realized cables were on wrong?

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mechanic mark said:

Check for blown fuse, also using 12v test light start at battery working your way to starter. How long time wise was it before you realized cables were on wrong? Not long, when I put on negative cable to positive terminal it sparked and I pulled it off.

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Generally that all it takes to destroy ignition coils as NPN transistor don't like being reverse bias. But you ar not even a starter response then the main fuse is blown for starters. Then there is there will possible other probelms like the engine no longer charging the battery to where the ignition have failed. Sometime you get lucky on the coils and they still work.