67 horn problem

[Jim S.]

I have a 67 - had my horn relay refinished - but now the horns do not blow when pressing button - i tested the horns - removed the horn button and everything looks good - i also removed the ring under the button which has the little L shaped strip which looks to be a cancellation trip - the little contact which comes up via the spring seems to be good but still no sound - how does one test the circuit including the contact under the button to the relay and then the relay itself? Thanks Jim

[Mike M.]

Re: 67 horn problem

check rag joint for continuity.mike

[Stephen L.]

Re: 67 horn problem

Reference your wiring diagram:

Short the #20 Black wire on the horn relay to ground. If the horn sounds your problem is in the horn button circuitry.

If not, check to insure the relay is grounded thru the #12 black wire and that there is 12 vdc on the red wire.

You can also check for continuity (low ohm reading) between the #20 wire pole and the #10 red wire. (Before you do this, disconnect the red wire & battery) This will indicate if the relay coil is open/broke. Infinity = damaged coil winding.

[Jim S.]

Re: 67 horn problem

Stephen, Thanks - here is what i have found out - 12v to the red and black wires with spade clips/terminal strip with screws at the relay - horns do not sound - when pulling off the black push on wire (next to push on green) and shorting it to ground horns do not sound - pulling off the green wire and shorting it the horns sound. I know i am missing something but what????Thanks Jim

[Jim S.]

Re: 67 horn problem

Mike - checked for continuity thru the rag and i do have - Thanks Jim - any other thoughts gentlemem

[John H.]

Re: 67 horn problem

when pulling off the black push on wire (next to push on green) and shorting it to ground horns do not sound Jim

Did you short the black wire to ground, or use a jumper after unplugging the black wire and short the terminal for it on the relay to ground? If you use a jumper and short that terminal on the relay to ground and the relay doesn't click, the problem is in the relay.

[Jack H.]

Re: 67 horn problem

Start with the horn relay itself and verify it's working properly. Don't know how to check the functionality of a horn relay? Well that's pretty simple!

The cover is annotated with 'H' and 'S' embossed letters such that it doesn't matter which way the cover is attached to the relay. 'H' means horn and 'S' means switch. The embossed letters refer to the function of the relay terminals DIRECTLY below (on the bottom of the relay).

The relay works via contact closure to ground for the horn switch. Disconnect the S and H wires connected to the relay and use a jumper wire to ground the 'S' terminal. A test light ought to show the 'H' terminal jumps up to B+ voltage in response.

Once you've confirmed the basic functionality of the relay, then work backward or forward along the wiring path as required.

Is the 'S' terminal lead in the engine compartment going to ground when you press the horn button on the steering column? If not, find and fix the problem(s).

If the switch or 'trigger' is working properly, work forward to the horns. Are they seeing full voltage from the relay's 'H' terminal? If not, find and fix the problem(s).

If the horns ARE seeing correct B+ voltage, you've got one of two problems: (1) the horns are defective, or (2) the horns lack proper grounding.

[Stephen L.]

Re: 67 horn problem

Jim, Check your connections at the relay again.
They should be as follows:

1) Black wire (coming from orange wire in harness [fusible link]) should be connected to a tab under a screw on the relay.
2) Red wire should be connected to the same tab under a separate screw.
3) Green wire plugs into relay
4) Black wire from horn button plugs into relay.

5) I believe this might the problem wire: A black wire with a RING connector should be connected to ground using the relay mounting bolt and star washer. This provides a ground to the relay.

[Jim S.]

Re: 67 horn problem

Jack - Thanks for the info - no i did not ground the terminal to after removing the black wire which is under the "s" i just grounded the black wire - I will try grounding the terminal and let you and everyone know. Again thanks - thanks - thanks - wiring problems are not in my bag of knowledge.

[Jim S.]

Re: 67 horn problem

Steve - thanks for the info - Jack gave me the same info - and as everyone can see wiring problems and chat rms are both not in my bag of knowledge - i will try grounding the terminal and let everyone know. again thanks - thanks - thanks-----JIm

[Jim S.]

Re: 67 horn problem

John/Steve - tried taking the black lead off the relay and grounding that terminal and not the wire this time and the horns did not sound so I think after reviewing your two suggestions (which paralled each other) that the relay is bad so i have ordered another. Thanks again for EVERYONEs input. Jim

[Del S.]

Re: 67 horn problem

Jim, Check your connections at the relay again.
They should be as follows:

1) Black wire (coming from orange wire in harness [fusible link]) should be connected to a tab under a screw on the relay.
2) Red wire should be connected to the same tab under a separate screw.
3) Green wire plugs into relay
4) Black wire from horn button plugs into relay.

5) I believe this might the problem wire: A black wire with a RING connector should be connected to ground using the relay mounting bolt and star washer. This provides a ground to the relay.

Steve , does the green wire plug into number 1 or number 2 junction on the horn relay or doesnt it matter ? The wiring diagram or AIM doesnt identify . thanks Del

[Jack H.]

Re: 67 horn problem

I don't bother to use wiring color codes... The 'green' wire is switched power out of the relay to the horn(s). It should plug into the relay on the terminal directly below the 'H' emboss on the horn relay cover.

[Stephen L.]

Re: 67 horn problem

Del, on the cover of the horn relay are the letters "S" and "H". These stand for the connection below them where "S" is switch (black wire) and "H" is horn (green wire). If the relay is original then the green wire will be toward the rear of the car.... I don't know how to better explain this.

Steve

[Stephen L.]

Re: 67 horn problem

Jack, you "don't use wiring color codes"? How do you determine which wire is which in a multiwire bundle???? HUMMMM......