my 1989 Ford Bronco will not start at the key. have replaced lock cylinder. even replaced the steering column What might my problem be/ the sterring column

so does that mean you replaced the ignition also? might want to check the starter.

i had the same problem with my 88 F-150,everything lit up but the truck did not start.i had a short in the wire going to the selenoid on the fender so i ran a new power wire to the selenoid and put a push button switch inside the truck. turn the key in your bronco till the dash lights up,then run a power wire from your battery and just touch the power terminal on the selenoid and if it starts you found the problem.easy fix with a push button swith. hope this helps!

JUST CHECK VOLTAGE AT SOLINOID EXCITER WIRE SHOULD BE 12 V IF THIS FALLS BELLOW 11 V YOU WILL HAVE A DRAMA. JUST FIT A RELAY!