My Mazda Protege won’t start...Help!

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2003 protege 5
Hi, I charged battery and polarity reversed now car no start anymore:cry:. Any idea where to start to diagnose this problem. I obtained a good battery but no power to starter. Only lights that come on are dash speedometer. Thanks!
 
Changed fuse and everything is fine, thanks!

The main fuse is under hood, right side of engine, it can’t be taken out unless the 2 - 10mm bolts are unscrewed.
 
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