I changed my radiator today and I took my battery out. Well when I put it back in, I put it in backwards and I put negative to positive and positive to negative. When I put it in correctly my car wouldn't start, the engine wouldnt even turnover. My lights worked and so did evrything else. I thought it might have been a fuse but I checked them all and they're all fine. Does anyone know what could be the problem?

 

If the fuses are fine, then it can be a number of things that dont like reversed polarity

ECU
starter
alternator
distributor

If you cannt hear the starter "clicking", then this would be your best bet. If you can see the idiot lights, and the car seems to be performing the initial self-test, then -i guess- the ECU is fine. Check starter first...

 

Check the black 80A main fuse under the hood. We'll asume that's good though since youre getting main power to lights. Next check interior fuses like 15A engine and 7.5a charge or room, hell check them all. Everything in the 7 is fuse protected so I doubt it got in long enough to cause a major problem but anything is possible.

IF you dont find it then, we'll have to break out the FSM.