Horn will not work on 68 GTX

[BumperMan]

Guys need some help, I cannot get the horn to work on my 68 Plymouth GTX. Can someone give me some advice on where to start when working on a horn?

The car had been sitting inside a garage since 1973 if that matters.

Thanks in Advance for the Help

 

[mopar 3 B]

Have you installed a good 12 Volt battery? Checked to see if the horn relay is there? It does have horns installed? What happens if anything when you push the horn button?

 

[65-440]

try jumping your horn terminal to battery voltage, just to make sure the horn is good. if so then make sure when you push the horn button that it is sending ground to the relay. Do you have a wiring diagram ?

 

[Yatzee]

I had a similar problem with my horns and discovered that ground to the horn relay was not being made through the steering column when the ring was pushed. Turned out that I had to run a wire from the top section of the steering insulator biscuit to the bottom section of the steering shaft. This may or may not be your issue as ground has to be made through the steering column.

 

[440roadrunner]

Have you installed a good 12 Volt battery? Checked to see if the horn relay is there? It does have horns installed? What happens if anything when you push the horn button?

If you don't have one obtain a factory shop manual. You can download them, free, over at MyMopar

http://www.mymopar.com/index.php?pid=31

Also, you can get third party wiring diagrams there which are sometimes easier to follow, but not always compete as to options.


HOW it works. The horns are supplied power off the load terminal of the relay. Battery power is fed to another terminal of the relay.

The third terminal of the relay is the button terminal and is grounded to operate

Here is the relay diagram, the relay is somewhere under the hood

Dark green is power to the horns

Violet is battery "hot" coming to the relay

Black is the horn button wire. You can jumper that right there at the relay with a probe and clip lead, and the horns should operate, if not the relay should click

That black wire goes through the bulkhead connector, into the car, through the column connector for the turn signal switch (still black) and up to the horn switch. You can also ground it with a probe at the column switch connector, and see if it works. If so, "its in" the horn button

 

[uwss]

Ground is usually the problem .

 

[5.7 hemi]

Sand in between the horn contacts on the steering wheel, worked on my uncle's 70' RR.