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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

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Old 10-03-2010, 08:58 PM
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92 f150 horn wiring

i took a 93 cab and put it on a 92 and the horn didnt work. i had this problem last time and i got a wiring diagram and changed a wire and the horn worked. does anyone have access to a wiring diagram of the 93 150 cab? then i need one of the 92 f250 with a manual

thanks

Matt
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Old 10-04-2010, 07:54 AM
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92 Horn:
Click the image to open in full size.

1993 Horn:
Click the image to open in full size.

/
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Old 10-04-2010, 07:56 PM
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thanks bill, but do you have one that shows the color after the horn switch listed above? i dont see anything but db? i have a solid blue and a blue and white and i think those have something to do with it

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Old 10-05-2010, 06:31 AM
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The 92 ground goes to G201 on a black wire.
Click the image to open in full size.

The 93 is grounded at G200 over a black wire with a white stripe after it goes through the speed control amp in at pin #6 DG/O wire and out on pin #10 red/light blue stripe wire (same as the PSOM ground).
1993 wiring:
Click the image to open in full size.
Click the image to open in full size.

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Old 10-05-2010, 06:59 AM
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ok, for some reason i remember applying power to the blue wire and grounding the blue and white. does this make sense?
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Old 10-05-2010, 07:25 AM
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ok, for some reason i remember applying power to the blue wire and grounding the blue and white. does this make sense?
No it does not. Are we talking about the 1992 or the 1993 trucks wiring.
Also do they both have speed control?
The big difference for the horn circuit between 1992 and 1993 is the speed control. The 1992 uses vacuum and the 1993 is all electric.
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Old 10-05-2010, 07:09 PM
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i am not concerned with the cruise, but need to get the horn working on the 92 f250 with a 93 f150 cab on it. ha
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Old 10-05-2010, 07:15 PM
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The ground wiring for the horn button goes through the speed control module and if you are using 1993 wiring the horn will not work without the speed control module.

If you are not using the 1993 speed control module and are using the 1993 wiring you must jumper the 6-10 pins on the speed control module plug to get the horn to work.
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Old 10-05-2010, 08:00 PM
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ok, i am confused as to what the speed control module is. is it something that i can swap to make the cruise work? that would be neat
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Old 10-05-2010, 11:07 PM
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ok, i am confused as to what the speed control module is. is it something that i can swap to make the cruise work? that would be neat
Cruise Control is the GM term. Ford calls it Speed Control.
On a 1993 it located LH side of engine compartment, near brake master cylinder.
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Old 10-06-2010, 06:49 AM
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yea, on my 92 there is a huge vacum drum that is bolted to the fender wall.
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Old 10-06-2010, 06:49 AM
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