anti theft problem 93 Explorer

My 1993 Ford Explorer limited will not start due to a problem with the anti theft system. I was driving when the horn came on without being touched. It was a steady sound unlike the off/on sound made when the alarm is activated. I pulled over, disconnected the horn and continued on with no problems. At the next start up the headlights started flashing but the car did start. Now when I attempt to start the vehicle the lights begin to flash and the horn goes on. I can turn them off with the remote but when turning the key to the start position nothing happens. The key for this old a car does not have a microchip. The rest of the electrical-AC, radio all seem to work. I really don't want to tow it into the dealer. Any ideas out there?

This is an aftermarket alarm system I suspect. Remove all of it.

Aftermarket car alarms disable the starter via relay. When the alarm is armed it will send a ground to the relay to disable the starter, Find the alarm, most likely under the dash and pull the fuse going to it and see if it starts.

My 1993 Ford Explorer limited will not start due to a problem with the anti theft system. I was driving when the horn came on without being touched. It was a steady sound unlike the off/on sound made when the alarm is activated. I pulled over, disconnected the horn and continued on with no problems. At the next start up the headlights started flashing but the car did start. Now when I attempt to start the vehicle the lights begin to flash and the horn goes on. I can turn them off with the remote but when turning the key to the start position nothing happens. The key for this old a car does not have a microchip. The rest of the electrical-AC, radio all seem to work. I really don't want to tow it into the dealer. Any ideas out there?