I have a 1990 Honda Accord. I have changed the ECU, ozone censor, it turns over, but wont crank. Any Ideas.

The other day the back tail lights came on & wont go off

 

welcome to the forum. Spark plugs, plug wires, distributor coil/ignitor, mail relay, no compression, timing belt, Kind of guessing, not much details to work with. sorry.
tail light on, short in the light switch. If brake light, brake switch.

 

I had a similar problem. A few months ago, my brake lights would not go off. It caused my battery to die. The problem was a little plastic pad that was attached to the stem of the brake pedal had broken off. This piece depresses a switch that turns the brake light on and off. I was desperate to solve the problem at 11p.m. and ripped an eyeball out of one of my wife's stuffed animals, which was the approximate size. Worked like a charm- still to this day. She still blames my poor dog for it.