I have a 1992 Honda Civic LX and I have replaced the following: main relay, fuel filter and pump, ECU, plugs, wires, ignition coil, distributor, wire harness under hood, all fuses, and dash wires... still will not start. Turns over but will not start completely. Yes it has gas and oil. I even tried to turn the ignition switch over and it does but however does not give me a reading. It just beeps and the engine light goes off.
The problem sarted when I put in a radio and the next thing I knew the lights went out and when I replaced those fuses the car would not start after that. Can anyone help me please!!

Ensure the ACG (ALT) (S) fuse, located in the under dash fuse box, is in the slot and tests okay with a test light or multimeter.

When you turn the ignition switch to ON (Position II), does the Check Engine Light come on for 2 seconds and then go out? During this interval, can you hear the fuel pump run?

Do I need to disconnect the negative battery cable first?

No.

The ACG (ALT) (S) fuse may be located in the upper right hand corner of the fuse box, close to the SRS fuses--it's often overlooked.

Yes the light does go out. No I can not hear the pump run. It is new.

How about the ACG fuse?

This link should help isolate the fuel problem:

https://www.askmehelpdesk.com/cars-trucks/faq-how-troubleshoot-repair-maintain-hondas-selected-other-vehicles-46563-7.html#post1245523

The one inside the car fuse box? I checked all of them and they read good. I even took the battery to have it checked thinking maybe it took a lot of crank out of it when the radio blew the wiring. The battery is 2 yrs old but it tested good.

If that link doesn't solve the problem, you or someone else will really have to get down and dirty.

I am going to try it after work. Thanks for your help. Wish me luck!