horn relay

Reply Subscribe

Thread Tools

Search this Thread

Dec 1, 2015 | 06:22 PM

brian1080

Thread Starter

Fleet Mechanic

Joined: Feb 2010

Posts: 1,742

Likes: 5

From: Near St. Joseph,MO

horn relay

Can someone tell me quick where the horn relay is on 78/79 trucks? I think mine is missing, but not sure where it's supposed to be.

Dec 1, 2015 | 06:54 PM

mikeo0o0o0

Hotshot

Joined: Apr 2009

Posts: 14,333

Likes: 247

From: Stanley, VA

78's & '79's don't have a horn relay unless it came with factory cruise control.

Dec 1, 2015 | 07:31 PM

HIO Silver

Fleet Owner

Joined: Dec 2009

Posts: 20,678

Likes: 82

From: NorCal

Here's a 79 wiring diagram shwoin the relay connected to the speed control system. The non-speed control setup is a switch straight to the horns.

http://www.fordification.net/tech/im...aster_8of9.jpg

Dec 2, 2015 | 07:21 AM

brian1080

Thread Starter

Fleet Mechanic

Joined: Feb 2010

Posts: 1,742

Likes: 5

From: Near St. Joseph,MO

I think my wiring is from a cruise control truck. Matter of fact I know it is because the extra plugs are all there. Anyone know where it is in a cruise truck and if it looks the same as the earlier fords?

Dec 2, 2015 | 12:57 PM

jas88

Lead Driver

Joined: Feb 2002

Posts: 7,957

Likes: 592

From: Greater Austin, Texas

On my '74 the horn relay is on the inner right side fender, next to the battery.

Dec 2, 2015 | 01:36 PM

brian1080

Thread Starter

Fleet Mechanic

Joined: Feb 2010

Posts: 1,742

Likes: 5

From: Near St. Joseph,MO

Not the same place on 78. I want to think it was in the dash when I removed the harness from donor,, but I can't find my pix to look for it. I'm working with about 5 different trucks worth of parts and just as many harness', so it's a job. Horn and reverse lights are the two only electrical things not yet working.

Dec 2, 2015 | 03:26 PM

mikeo0o0o0

Hotshot

Joined: Apr 2009

Posts: 14,333

Likes: 247

From: Stanley, VA

Quote:

Originally Posted by brian1080

Look at the link HIO posted for you. Go to the bottom of the page and look at connector C-301. That's the horn relay. It also tells you the location. It's under the dash, on the cruise control amplifier.