So the turn signals in my 76 F100 stopped working. I knew that the bulb sockets and bulbs were OK because my running lights and my 4way flashers worked. I was having trouble reading my fuse box to see which fuse might be blown. I found an image of a fuse box here, but the arrangement doesn't match mine.

I decided maybe I had trouble at the turn signal switch, so I removed my Grant wheel to investigate. I tried removing the turn signal switch but after removing the turn signal arm and 4 screws at the top of the column, I couldn't pull it off to inspect it because there wasn't enough slack in the wire harness.

I went back to the fuse box, and found by using a jumper wire, the bad fuse. By jumping with the wire, my turn signal were working. So I decided to button the steering column back up and go buy a replacement fuse.

In recent years (I haven't been driving the truck much) the horn hasn't been all that reliable. Sometimes it would sound, but maybe after 3 or 4 pushes of the button. Now as I was tightening the turn signal switch back onto the column, the horn started blowing. I couldn't tighten my steering wheel onto the shaft without the horn going off. To save my relationship with my neighbors, I disconnected the power lead from the horn.

I would like to have a functional horn and don't want some random short inside my column. I'm assuming I have a horn wire that has chaffed and is shorting to ground as if I'm pushing the horn button, somewhere as part of the turn signal switch or on the back side of it.

I'm thinking I need to replace the switch and harness, or figure out which of the the wires in the harness are about the horn and rigging some alternative horn button.

Is there any trick to getting the wiring treaded through the steering column tube?

 

Do you have the 2 slip on connector for the horn? Sounds like your horn pad has a broken spot in the plastic.

To get t/s switch wire slack unplug it under the dash and feed some up the tube? I do not think you will get much.

When you take the wires one at a time from the plug, before you do, take a digi pic of their placement and draw a diagram (wire color versus placement in plug) thread a sting down the tube to pull the taped together wire bundle back up thru.

Here are some diagrams of fuse box ect...https://www.ford-trucks.com/forums/1...then-some.html

I have an alt horn button om my silver truck, I can ck wires in a few days.