69 horn relay testing

What are the procedures for this?

Thanks

 

Re: 69 horn relay testing

One way is to use a DVM set on "Ohms". Unenergized, the ohm will read infinity, energized, the reading should be pretty close to zero. Another way is to hook up a test light. You have to determine which terminals are the coil and which are the switch. Some relays only have 3 terminals, the 4th being the case ground.

This link should help:

http://www.autoshop101.com/forms/hweb2.pdf

alan

 

Re: 69 horn relay testing

I'm going from memory so the connections might not be right....

12V always hot is connected to the screw terminals. There will always be 12V on the hot side of the relay coil. You need to ground the other side of the coil to energize it.

With the relay mounted so the the plastic shrouded plug terminals are facing the driver side fender....
Verify 12V on the screw terminals.
I think the upper left plug terminal when viewed from the left fender (against the core support) is for the black wire from the horn button, i.e. grounded when horn is pressed.
The L shaped connector beside it goes to the horns (green wire).
If you ground the upper left terminal, the relay should energize you should get 12V on the L shaped connector to the horns.

If nothing happens then the relay is bad. If it sounds/energizes grounding directly at the connector but doesn't with the horn pressed then you move on to troubleshooting back to the horn button and find why it's not grounding the black wire. New ones are $20 or so at any parts store unless you've just got to have a Delco Remy one. The relay case does not have to be grounded.

 

Re: 69 horn relay testing

Went and got a new relay and didnt help my problem. The frt side marker lights stay on all the time even with the light switch in the off postion. The horns blow all the time when connected. Looked at the wiring D and just dont know where to check next.

New engine and light harness installed . Im puzzled.


Mike

 

Horn..
Check the ground signal wire,at the horn relay, is it grounded? If it is, there most likely is something wrong with the assembly of the horn button.Stock steering wheel?

Marker lights..

Are the side markers on? How about the rear park lights?

Just for grins, try disconnecting the turn signal switch, do the lights go off?

 

Original Wheel , Rear marker lights are NOT on.

Thx Dale

 

Horn relay may be stuck. Disconnect the black horn button ground lead that comes from the steering column, then hook a test lead to the spade. Then listen as you ground the other end of the test lead to the radiator shroud, and disconnect the ground. You should hear a CLICKING noise as the relay closes, and opens. If you don't hear it then the HORN RELAY needs replacement or rebuilding. But if it is working just fine, in the test then the issue is on the black wire to the steering, or in the steering wheel. You can ohms the wire to see if its grounded - which is the close the circuit and sound the horns action of the horn button on the wheel.

Could be a simple pull the steering wheel - that's not the simple part - and gently retentioning the small spring that holds the wire contact away from the horn buttons. Like pulling on a ball point pen spring. Or the wire is grounding out in the bay or in the column and that will be a bug hunt.

Side markers on the fenders right? These are just off the headlight switch harness and are not part of any flashers or turn signals. I would reset the headlight harness on to the switch and see if that fixes your situation. Once disconnected from the switch do they go off? Plug in the switch and they go on?

Otherwise you may have a bad headlight switch. Using the wiring diagram you can shunt power through the spades of the connector to activate the exterior lights, and headlights, just use a heavy gauge wire to shunt with if you are going to activate the headlights as part of the testing cycle.

 

Substitute a test light for the horns, less noise.
The blue wire on the h/relay is from the steering wheel horn switch. As Dale suggests, a ground on this wire will energize the relay.

Side markers are jumpered at the firewall connector in parallel with the parking lights.
Looking at the f/conn from the front, on the right hand connector, bottom row, brown wire (side marker) is the second from the left.

The brown wire, side marker power, may be swapped with the blue wire one row up, horn relay power - wire to the s/wheel horn switch as the horn wire is hot, battery voltage.

 

Thanks Guy's . I just put a new horn relay on yesterday with no results. When I connect the battery you can here the horn relay CLICK. The Key buzzer quit working also as it had worked at earlier from putting voltage to the harness. It could be possible the bulk head connector at the firewal maybe a problem on the lights. It has a new head light switch also but who's to say it's didn't go bad. I'll try some suggestions and hope this works. Evrything was going pretty good, engine running, headlights working, I did notice last night the right turn signal is not working. I need to trace that to.

Thanks

Mike

 

Right turn signal - After you check the bulb - Check under the battery. If you've had any leaking it will drip right on the connector to the right side turn/parking light connector.

Marker Lights - Bypass the horn relay. Red to red at the terminal. See if the lights stay on. If not then the problem is back feed through the ground when the horn is stuck on

Bad Headlight switch - probably the rears would be on too so I would not think this is a problem

Disconnect the harness at the base of the steering column. Does the horn relay still click on? If so your horn wire is grounded at the steering wheel. If it still clicks on your issue is not in the steering wheel/horn button.

Do you have a good wiring diagram? I have full color PDF for 69 if you need it pm me and I can email it to you.

 

Re: 69 horn relay testing

Mike Im going to merge your 2 threads, they are both dealing with some of the same issues. Easier for folks to follow up with you this way.

 

Re: FIXED 69 Frt Side marker lamps and horn on All the time

Thanks for everyone's input on this issue. Took the bulk head connector loose and found a bent terminal.

Thanks Again

Mike