horn relay

[Rufcar]

My horn died in my 73 RS hot rod. Before i rip off the custom steering wheel thought id check the relay 1st. Where is the horn relay located? I tested all fuses there fine thought id look at the relay but can t find it? HELP! jim

[HarryD]

Hi Jim,

If you have a stock fuse and relay panel, the horn relay should be next to the Fuse Panel in the trunk on the drivers side. It is in the lowest postion.

[Rufcar]

Harry thanks I did then go to my work manuals and they showed 3 of them. Mine was behind the canister and I didnt see it! I have (1) in my 73 not (3) as shown in the manuals and it was a Werhle 91161570901 and when I searched I could not find if that was it or not. I looked here on Pelican at other options and found a 91161510901 that appeared to be the same in size and with 5 pins. I did order it and Im fairly certain its the one I need as mine is the original 73 relay! Thanks

[HarryD]

Glad to help!

As additional information, per my shop manual, there are 4 relay positions in an early car next tohe fuse box. Depending onthe options fitted, the postions are used as follows:

(Top position is #4, Bottom Position is #1)

One relay
4-Unused
3-Unused
2-Unused
1-Horn

Two relays
4-Unused
3-Unused
2-Fog Lights/Aux Driving Lights/AC
1-Horn

Three relays
4-Unused
3-Aux Driving Lights/AC
2-Fog Lights/Aux Driving Lights
1-Horn

Four relays
4-AC
3-Aux Driving Lights
2-Fog Lights
1-Horn

[Rufcar]

Harry I have the (1) so all I have is the horn. My guess is that is what I need, if not then Ill do the button Im betting on the 37 yr old relay! BTW my car is featured in this months ESSES magazine page 09! Thanks again

[HarryD]

These threads will be helpfull:

horn not working 1987 911

Need help rewiring my new horn relay connector.

This is the part you need:

Originally Posted by HarryD

There are two electrical circuits for your horns.

Circuit one energizes the coil of your relay when you press the horn button. The other connects the battery to thehorns them selves.

If you have someone press the horn button while you listen to the relay (put a screwdriver against the relay and the other end to your ear), you will hear a click as the contact moves. If you do not hear the click, then the problem is with the circuit from the horn button to the relay. If it does click, then the problem is between the relay and the horn.

To troubleshoot further:

1-Disconnect your battery.

2-Unplug your relay and use your continuity tester to verify that your socket has:
a-Continuity between the battery and pins 30 and 86 of the socket. Check the other 3 pins to verify no continuity.
b-Continuity between pin 87 and ground (with the horns in the circuit, the resistance will be greater than 0 ohms) and no continuity between any of the other pins.
c-Press the horn button and verify that you have continuity between ground and pin 85. When you release the horn button, the continuity should go away.

3-Check your relay to verify:
a-That you have coninuity only between pins 30 and 87a; and
b-pins 85 and 86.
c-There should be no continuity between any of the other pins.

Report your findings

Also, this thread may be of assistance to you as well: Need help rewiring my new horn relay connector. - Page 2 - Pelican Parts Technical BBS