Horn Wiring and the Steering Column - Saabnet.com Bulletin Board


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Horn Wiring and the Steering Column
Posted by Juan [Email] (more from Juan) on Sun, 5 Mar 2017 15:07:35
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I have a 1974 Saab Sonett. Have only owned it less than two months. Lots of electrical issues but most of then thus far have been relatively easy to resolve: bad ground, dirty, filthy, corroded contacts on bulb, the base or the connector. A little cleaning and/or fixing of the ground and the device worked. Only had to replace the regulator thus far. Car runs well otherwise. Yes, I have the classic trunk rust and a small spot of driver's side rust.

The horn is mystifying to me. At first I assumed the horns themselves didn't work. Took the nose off the car (not that hard, didn't take that long) Actually one horn was missing and I took the other horn off and hot wired it to the battery in the trunk. Wow, it's very loud especially when your head is on about two feet from it and you are bent off the trunk!. So that works.

I removed the button switch on the steering wheel. One wire coming from the center of the steering column and connecting to a spade connector on the horn button switch. On the other side of the button a wire was soldered or braised to a copper-like loop on one side of the button switch. The wire from that connection appears to be grounded. Continuity was checked between the ground wire at the horn and the wire coming from the center of the column and then to the button switch. NO continuity. So there is a problem with this wire.

My question is how does this wire work ? I have reviewed the Sonett Service Manual and the illustrations for the horn & steering column do not provide any hint as to how this is connected. In the Service Manual on Page 641-1 the illustration for the Sonett made from 1971 show the wire going down the center but I have never seen what happens next. I have seen illustrations of how VW steering columns and the horn wires are set up and i have seen how the saab 95/96 horn / steering wheels are set up. They both employ a rotating disk that the wire is attached to or something similar.

i have not found where the wire come out either. I hope to thoroughly inspect the column this week but give me a hint here (or an illustration). How does this work? Does this wire go to the directional signal switch and get the ground here? or is there somewhere else I should look? Does it come out before or after the firewall (engine side or cockpit side)? How can I find where this OPEN connection (broken wire) is?? How have others fixed this? I have seen references on the Sonett BB that says this wire fails but no one has provided any details (or I can't find them here). HELP, please. Thanks

posted by 68.9.17...

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