I have a 1998 Honda Civic DX. Today I was installing some lights under that dash board. I connected the red wire of the lights to the radio fuse and the black one to a ground. Then I took a switch and connected the ground to the other ground and the red one to the lights red one which was connected to the radio fuse. This completed the circuit. I then turned the car to the on position but did not start it the switch was in the off position and the lights turned on and everything in the car that should have did too. Next I turned the switch to the on position and it turn the lights off but also the radio. I tried to start the car but now it wont turn over. I checked all the fuses they all seem to be fine. Yes I realize i wired the lights wrong. But now that i disconnected all of that the car still wont start. what could be wrong with it now?

 

If you connected to the wrong end of the fuse and had a short circuit (which is easy to do by mis-wiring those switches with a light in the switch), it may have blown one of the main fuses under the hood.

Before piggybacking an accessory onto a fuse, pull the fuse out, turn the key on and measure which one of the contact points for the fuse is live (voltage from there to ground). This is the UNFUSED end. You need to connect your accessory to the OTHER end. That way if the accessory circuit has a short, only that one small fuse will blow and not one of the big ones.

 

i did check the fuses under the hood they all seemed fine too

 

How are you checking? Do you have a voltmeter? You should check each fuse for having battery voltage on both ends to ground. That confirms the fuse is not blown.

 

Try tapping on the the starter to see if it's not stuck on a flat spot.