hey guys. haven't driven my truck in a few weeks. took it out yesterday and the cruise didn't work. when i parked and locked it i noticed the horn didn't honk upon hitting the lock on the fob. tried the horn when i got back in and nothing. found fuse 37 (i believe that's the horn) blown. i do not have any lights on (airbag etc.) i replaced the fuse and it blew immediately. short somewhere i guess. reading clock spring or short in the horn. what are my next steps? was thinking unplug the horn replace fuse and see if fuse blows? if that's a solid plan where is the horn at? i found some info under the battery but i don't see anything under the battery? if not the horn then i'd guess clock spring?

any help appreciated.

thanks
andy

 

Do any recent work on the driver's side of the engine bay?

I had to pull my blower motor, which involves pulling the cruise control module.
Since it was cold and rainy, I figured I'd put the cruise control module in later. I just left it on the passenger seat. (I leave lots of half finished projects all over.)

Later, in traffic, someone wasn't moving... I hit the horn, nothing. I figured the horn switch went out, as I do have to lean on the wheel to hit the horn.

Nope... The horn is wired through the cruise control module.

 

i had amp power boards installed...the module is mounted right behind the battery, also had an additional power run done form the battery. didn't consider it could have been that?

 

Impossible to know since we have no way of knowing exactly was done. However, if this issue surfaced immediately after that work was done, then the new work is definitely suspect.

The horn is somewhere up in the front of the engine compartment or in front of the radiator on the passenger side.

 

The ground for the horn switch indeed does go through the speed control module. However, if the module is disconnected, neither the horn nor the speed control will work, but it won't blow any fuses.

Impossible to know since we have no way of knowing exactly was done. However, if this issue surfaced immediately after that work was done, then the new work is definitely suspect.

The horn is somewhere up in the front of the engine compartment or in front of the radiator on the passenger side. Instead of worrying about it first, pull the horn relay and see if the short circuit goes away or not.

 

Great idea, where is the horn relay? I should get a service manual lol. I'll have to try it in a day or so..at the hospital having our first child. Shouldn't be thinking about fixing the truck but well you know!

 

Horn relay is probably documented in the owner's manual. Probably in the fuse box under the dash.

Good luck to you and Mom with the new baby!

 

Does the radio work? If not, then I say clock spring. A broken clock spring will inop horn, cruise, and radio. I know this because it happened to me

 

Thanks for reply. Radio is still pumping. It's aftermarket tho...not sure if that matters. And I do not have factory steering wheel controls.

 

I do not THINK that matters. Carry on with others who know more about this stuff than I do.

 

just had the same thing happen and turned out to be one of the horns was shorted out..

 

Where was your horn at?

Thanks for reply!

 

A shorted horn cannot blow fuse F37 immediately when it's installed UNLESS the horn relay is closed, either by being energized or defective.

 

True, I thought he meant when he hit the horn button it blew immediately as mine did. Good catch SHO...

 

when i swapped the 15 amp fuse it immediately blew, i did not have to press the horn button. just took at online owners manual here:
http://www.fordservicecontent.com/Fo.../03hdwog1e.pdf

it does not show a relay for the horn. next steps guys?


thanks