Horn button problem
Lead Gopher
Joined: Aug 2012
Posts: 10,014
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From: Seattle
Thanks for posting those pictures AZ.
The drawing in the 1966 shop manual above is the same drawing as was used in the 1961 shop manual. They often seem to just show a typical setup, but not always 100% applicable to each situation. Sort of like a Hayes or Chiltons manual. Between the 4-spoke wheel and the turn signal switch shown it is representative more of the 4x4 (except 1966 F100), F350 and some of the larger trucks. My 1966 F250 4x4s use that style of switch. In this case I believe it only uses the one brush in the steering wheel and when you push down it makes contact with both the back side of the horn button and the horn contact plate which has the horn wire connected to it, completing the circuit. Here's a picture so you can see this type of switch and wiring. I didn't want to muddy the waters too early but I think the pictures above show the other (more?) common type used on the 2WD trucks and 1966 F100 4x4 which is what most are going to run into. I just wanted to show the other style that you might see depicted often since that's what the shop manuals show.
Note that this style comes pre-wrapped with tape like this since it runs down the outside of the steering column and is protected by a cover that runs some of the length of the column held on by a clip. You can see the cover and clip in the shop manual drawing above that I posted the text of. All of the wires run through that cover despite it only showing the one horn wire. The horn wire is it's own wire connector on the lower end, too (blue/yellow stripe wire). The 2WD trucks, at least 1965 and 1966 you have to feed the wires down the slot in the column to hide them. No tape was needed to contain and protect the wires in that case. And it probably makes it easier to fish it down the column.
Chad
The drawing in the 1966 shop manual above is the same drawing as was used in the 1961 shop manual. They often seem to just show a typical setup, but not always 100% applicable to each situation. Sort of like a Hayes or Chiltons manual. Between the 4-spoke wheel and the turn signal switch shown it is representative more of the 4x4 (except 1966 F100), F350 and some of the larger trucks. My 1966 F250 4x4s use that style of switch. In this case I believe it only uses the one brush in the steering wheel and when you push down it makes contact with both the back side of the horn button and the horn contact plate which has the horn wire connected to it, completing the circuit. Here's a picture so you can see this type of switch and wiring. I didn't want to muddy the waters too early but I think the pictures above show the other (more?) common type used on the 2WD trucks and 1966 F100 4x4 which is what most are going to run into. I just wanted to show the other style that you might see depicted often since that's what the shop manuals show.
Note that this style comes pre-wrapped with tape like this since it runs down the outside of the steering column and is protected by a cover that runs some of the length of the column held on by a clip. You can see the cover and clip in the shop manual drawing above that I posted the text of. All of the wires run through that cover despite it only showing the one horn wire. The horn wire is it's own wire connector on the lower end, too (blue/yellow stripe wire). The 2WD trucks, at least 1965 and 1966 you have to feed the wires down the slot in the column to hide them. No tape was needed to contain and protect the wires in that case. And it probably makes it easier to fish it down the column.
Chad
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