where or what is the brain in my prelude i have changed the coil,fuel relay cut off,fuel pump,and still nothing so it only leaves me with the distibutor,brain, but no spark is the main thing so it is an electrical problem
The first thing I would check, assuming the timing belt is intact and the distributor is turning, would be the ignition fuse followed by testing the ignition switch.
If the fuse is good, then touch a test light to the positive terminal of the coil (black/yellow wire) and make sure there is power provided in both the RUN and the START positions.
If power is not provided, AND the fuse is good, then it’s likely the electrical part of the ignition switch is bad.