Laugh at me if you want, but here is what I think happened the day my horn started blowing all by itself.
1. Something in my steering column caused a ground connection to the brown wire that goes to the horn relay.
2. I unplugged the wire to the horn but the relay was still activated by the ground.
3. The still activated relay drained my battery.
4. Once the battery was dead, the relay disconnected internally.
5. Since removing the steering column from the truck, the ground to the horn relay has been eliminated.
6. I’ve discovered an incidental 1 mA drain on the battery that has nothing to do with the original horn problem.
7. I need a new battery. My battery must have been on its last leg because even after charging, it’s still not able to deliver 12V.
