924Board.org

[sparky]

Allooo all again,

I have been doing more work on the few electrical problems that are left on the car and have come to the horn.

When i press the horn button it does not work. I checked the fusebox and the fuse is good. Then i went to check the relay (top left) and there is an empty slot. Not even a socket for the relay.. I re-checked the haynes manual just to make sure that im not going crazy and it is meant to be in that position. After i looked all around the fusebox for any wires running around that might be the ones which should connect to were the relay should be, and there are none.

Now from what i remember the horn did once work on this car and I definately wouldnt have just removed the horn wiring all together..

Any pointers here?

Car is a 77..

Cheers!
_________________
When the checkered flag drops... The Bull$hit Stops

1976 Euro 924 (The 945) - Full 951 Brakes/Suspension

1998 Boxster with goodies
2002 3.0 Xtype 4wd sport

[StienbargerR]

have you checked the wire at the horn pad ? I would guess you have, but it could have slipped off.

Ryan
_________________
1978 924 NA
-250lb lowering springs, Euro Pistons

[sparky]

Hi Ryan,

I checked the wire there and its on well.. is it possible to have the horn not wired through a relay?

Mark (SparkY)
_________________
When the checkered flag drops... The Bull$hit Stops

1976 Euro 924 (The 945) - Full 951 Brakes/Suspension

1998 Boxster with goodies
2002 3.0 Xtype 4wd sport

[Lizard]

there is a relay up there for it, however it sometimes gets moved if the fuesbox ever gets taken out.
_________________
3 928s,

[sparky]

Cheers lizard,

Does anyone know what color wires should be attached to it?
Or how to trace which one it is?

From what i could see only the top relays are movable, i am also presuming that is will be a silver small relay. Doh! I now have a mental image of which one it is!

Ill give changing it a shot tomorrow.. thanks again for the help! Ill keep in touch!
_________________
When the checkered flag drops... The Bull$hit Stops

1976 Euro 924 (The 945) - Full 951 Brakes/Suspension

1998 Boxster with goodies
2002 3.0 Xtype 4wd sport

[Neil924]

The wire wasn't cut was it? I switched the steering wheels on the car before and when I turned the wheel while installing, the wire was severed.

[sparky]

Hey Neil,

Ill re-inspect the wire tomorrow, I have not changed the steering wheel yet as i am still waiting for a momo hub adaptor. Does the horn pad just pull off? Or are there some screws holding it on?

Having all my tools in one garage and the car in another is a PITA as i have to make sure i take all the right tools everytime i need to do anything on the car..

Cheers!
_________________
When the checkered flag drops... The Bull$hit Stops

1976 Euro 924 (The 945) - Full 951 Brakes/Suspension

1998 Boxster with goodies
2002 3.0 Xtype 4wd sport

[StienbargerR]

If you have the two spoke wheel, it just pulls off.

Ryan
_________________
1978 924 NA
-250lb lowering springs, Euro Pistons

[Smoothie]

Of course horn not working is among the plethora of electrical problems I've had. Could be due to the things that were mentioned already, but I think the most common cause is loss of ground through the steering shaft. The ground normally (or as intended by the factory) travels through the steering shaft bearings. As they wear, you loose the ground and the horn. (If this is the problem, you may get it to beep if you push up or down or turn the steering wheel while pressing the horn pad.) Most replace the bearing while some like myself add a wire to the firewall end of the steering shaft to ground it. See pics below - a small spot of paint was scratched from the shaft, then the blue wire with it's end stripped and tinned with solder was hose-clamped to that spot. -Then a ratchet wire-tie was placed over an insulated section of the wire (otherwise it would fray and break at the bare wire). Then I loosely wrapped enough wire around the shaft to allow full turning of the steering in both directions without straining the wire (which would be bad for both steering and the wire). -Then obviously pick a nice spot of shiney bare metal under the dash and attach the other end of the wire to complete the ground.


_________________
"..it's made in Germany. You know the Germans always make good stuff."


'82 924T, US version, dark green metallic, 5 speed Audi 016G gearbox

[Lizard]

if you find the horn relay (probably a small silver one) remove the relay and touch terminal 30 and 87 (it will list which is which pole on the bottom of the relay, and see if you get noise from the horn,

if you do then your ground through the steering column is the most likely culpret,

if you get nothing check for voltage at the 30 terminal,

you you have voltage check the horn and make sure it actually works,

if you dont have voltage there then you have to start tracing wires.
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3 928s,

[sparky]

Hey again,

I just came back from the garage and managed to make some progress on getting the horn working.

When i bridged the connections between 30 and 87 on the fusebox the horn blasted loud and clean. Then i tried putting in another relay which is good and had the same problem. I then tried holding the horn pad down and turning the wheel to see if it is the bearing that grounds the steering column, but not a squeak from the horn.

Where could it be going wrong?

Also when i was under there i did find one loose wire which was the voltmeter and re-connected it and that works well.

Cheers again!
_________________
When the checkered flag drops... The Bull$hit Stops

1976 Euro 924 (The 945) - Full 951 Brakes/Suspension

1998 Boxster with goodies
2002 3.0 Xtype 4wd sport

[Ozzie]

My horn was intermittent at best so after I did the wire repair smoothie said it works all the time now.
There was also a major wiring problem too but thats another story.
_________________
Porsche 924 1984 (UK import) NA
Its AUTO and its BLACK
Montego Black on black/red
Engineer of Electro/Mechanical Systems Maintenance

[sparky]

Would a good way to check if this will work for me before going ahead with it completly be to: get a wire and loosly attach it to a bear part of the steering column, and then attach the other end to an earth point?

Not a major problem as the car is still far from being on the road, but still being without electricity means i can only do these small jobs on the car for now, which definately needed attention anyway
_________________
When the checkered flag drops... The Bull$hit Stops

1976 Euro 924 (The 945) - Full 951 Brakes/Suspension

1998 Boxster with goodies
2002 3.0 Xtype 4wd sport

[Ozzie]

Get a wire and attach it to the wire going to the horn press and the body.
If it beeps then the shaft is the problem.
_________________
Porsche 924 1984 (UK import) NA
Its AUTO and its BLACK
Montego Black on black/red
Engineer of Electro/Mechanical Systems Maintenance

[Smoothie]

Yeah that'll test it.
Here's another way, but it also bypasses the horn pad, so only try it after and if your shaft grounding test doesn't make it honk -
Remove the steering wheel and with a piece of wire try grounding the switch's springy brass contact to a good ground - on my car with the later column switch that would be either to one of the screws that hold the switch in place or the switch's metal plate. -This bypasses the shaft ground, so if the horn works by doing this, you've narrowed the problem down to either the shaft-bearing ground or the horn pad and its' contacts/wiring.
The normal ground path is through that springy brass piece to the ring on the back of the steering wheel, through the steering wheel to the horn pad, then through that small wire from horn pad to the steering shaft, through the bearing to the ignition-steering lock then dashboard.
_________________
"..it's made in Germany. You know the Germans always make good stuff."


'82 924T, US version, dark green metallic, 5 speed Audi 016G gearbox