should be on your driver side fender well
Horn Relay???
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Horn Relay???
Where is it supposed to be on a 73? My electrical system has been Bubbafied pretty well. The contact for the horn button is broken, but that's a project for another day. I'm putting in an alarm which uses a horn output as well as the siren. I tapped into the black horn wire, but no go. I checked the horn directly, and it's fine. I'm looking for the relay to see if that's the culprit, but as of yet cannot find anything that looks like the relay shown in Doc Rebuild's catalog. I'm thinking maybe it's been replaced with a different one, but can't be sure since I don't know where it's supposed to be.
Burning Brakes
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Originally Posted by Todbo
Should be on your driver side fender well
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OK, making progress. There is something which is maybe a relay on the driver's side fender about even with the front of the master cylinder. It is connected to a few heavier gauge wires on a screw connector that is 12V all the time. There are also 2 connectors underneath. One was connected to the dark green wire, which connects to the horn. The other had no connector and would seem to be where the horn button wire should go.
However, this open connector tests 12V on the multimeter, and this would be where you would hook up a wire that is switched to ground. I'm thinking either:
1- This isn't the horn relay
2- Something is wrong with the horn relay
3- It is normal to leak 12V through the relay. It can be connected to the horn button with no problems.
However, this open connector tests 12V on the multimeter, and this would be where you would hook up a wire that is switched to ground. I'm thinking either:
1- This isn't the horn relay
2- Something is wrong with the horn relay
3- It is normal to leak 12V through the relay. It can be connected to the horn button with no problems.
Instructor
Joined: Feb 2004
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From: woodstock ga
it should have three wires. one of them is green. i dont remember what color the others are. the relays are cheap and chances are if your horn was not working before it is probally burned up. the cost about 15$ at your neighborhood autoparts place. 
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Well, considering that it wasn't even hooked up, that would probably be the main reason.
I have other relays that I can toss in there for the horn, but why bother if it is still good? What I need to know is if it is normal to have some current leak across the relay's coil, or if the relay is bad.
I have other relays that I can toss in there for the horn, but why bother if it is still good? What I need to know is if it is normal to have some current leak across the relay's coil, or if the relay is bad.
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Took it off last night and tested it in the house. It reads 12V on that terminal, but when grounded works perfectly. I guess that's how it's supposed to work. Put it back on, wired it to the alarm, and it works fine. Now I just have to fix the connection inside the steering column...
Racer
Joined: Dec 2003
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From: NY
Originally Posted by WhichVette?
Well, considering that it wasn't even hooked up, that would probably be the main reason.
I have other relays that I can toss in there for the horn, but why bother if it is still good? What I need to know is if it is normal to have some current leak across the relay's coil, or if the relay is bad.
I have other relays that I can toss in there for the horn, but why bother if it is still good? What I need to know is if it is normal to have some current leak across the relay's coil, or if the relay is bad.
Pro
Joined: Nov 1999
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From: Front Range
I think the other wire that hooks up to that horn relay is the pink/blk key buzzer, isn't it?
absolutely right, the horn contact provides ground to complete the circuit and produce the field to engage the relay. if your alarm system activates the horn using a +12V signal, you'd want to patch it in to the green lead coming from the horn itself.
tbw
absolutely right, the horn contact provides ground to complete the circuit and produce the field to engage the relay. if your alarm system activates the horn using a +12V signal, you'd want to patch it in to the green lead coming from the horn itself.
tbw
