Horn wire in cab?

[EMDDIESEL]

Hi, trying to locate the wire that goes from the steering wheel to the horn relay. Anybody know what color it is and where to locate it in the cab?

 

[Evan A. Beck]

The wire is in Pin #32 in connector C134, which is the big one with a ton of wires in it under the dash. It is over near the parking brake. The wire is 20 gauge, and is black with a red tracer. #ad

 

[Evan A. Beck]

Forgot to add something... The horn relay is actuated by completing the ground path. That is, this BK/RD wire will be grounded when you push the horn switch in the steering wheel.

 

[DieselDoghouse]

EMDDiesel, maybe you could add a second horn relay under the dash:
bring 12v to the relay
ground it through the horn switch
carry the 12v around to the contacts (the common)-the NO or normally open contact would then go hot only when you hit the horn.
where they'd both be relay coils I don't think you'd get any sneak circuits between the coils.

 

[EMDDIESEL]

What i need is a positive source that turns on when you blow (push the steering wheel)the horn. I want to be able to hook it up to a switch so i can choose between the stock horn, the electronic air horn, or both. So if this wire you mention is a ground (negative) it will not work for me. My other option was to run wires all the way from the horns back to the cab, but i would rather keep this simple. Thanks again for your fast response. I really appreciate your help.