Horn Relay Control

[Moparfiend]

Simple question. I assume the turn signal switch to horn relay connection ( coil energizer ) is 12V from inside the turn signal switch and not a ground signal signal.

Horn stopped working need to determine if its my turn signal switch (more than likely) or relay.

 

[R413]

Wrong. The horn signal is a ground wire to the horn relay. Nothing powered for the horn is inside the column.

 

[Moparfiend]

Wrong. The horn signal is a ground wire to the horn relay. Nothing powered for the horn is inside the column.

Great that helps so much as I did try and ground the relay and it didn’t energize. So that confirms a bad relay.

 

[R413]

Do you have a wire diagram

 

[PurpleBeeper]

Besides corroded connections, I’ve had a horn go bad + poor ground connection in the steering wheel. To test the horn, run a hot wire from the + of the battery directly to the horn (while installed and grounded). To check the wiring and relay, remove the “horn cover” in the steering wheel and ground the single black wire to the center big nut that hold the steering wheel.

 

[Moparfiend]

OK it was the relay as I suspected. However It now it appears the horn signal (gnd) line is shorted (horn stays on) and I believe it’s the switch. I am running a Grant wheel. When I disconnect the turn signal header connector it’s off. Ohmed out the switch side of the connector and indeed it’s shorted to ground.

I researched this issue and I am not the same only person who has had this issue a d sequence however no documented solutions. Provided the wire is not pinched is there a common area inside the plastic switch assembly that gets broken causing the horn switch to short out and continuously signal the horn? It’s only a 2ft long cable and it’s a new switch……

I suppose another culprit is the horn assy in the Grant wheel. Il be taking the assembly apart and inspecting it.

 

[Moparfiend]

Now Im 90% sure it’s the Wheel horn assy. I’ll post my results later. Apparently it’s a very common issue….

 

[1967coronet]

Yes the copper disc and the spring plunger little brass contact wheel is were the problem will be. Unless the black ground wire is shorting out on something.
Grant wheel horn kits can be frustrating.

 

[gkent]

Grant wheel horn kits can be frustrating.

That's a fact.

My experience is that correct spacing is important - to the point I had to make a spacer for the Grant mount. The reason: if incorrectly spaced that little wheel deal will bind on the copper contact disc and wear the copper off - rendering it useless. Which it had done in my case. A cleanup during rebuild got rid of all the shavings but left me with the dilemma of a replacemnt disc - which I couldn't find at the time. The solution was a piece of blank PCB (printed circuit board - no holes) from which I cut another circle and bolted in place. Now works as it should.