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1987 Horn quit working and wire inside steering wheel button is not hot. Let me know if you've seen this before. I hate chasing wiring problems and have not even figured out which fuse or relay to check.
If there is no current to the wire, what is the point in grounding it? Circuit #28 is grounded by the horn button closing the horn relay to send current to the horns on circuit #29.
Behind the DIC (drivers information cluster) there is the Auxiliary Fuse block and the horn relay. You have to remove the radio/climate control bezel. 4 or so screws hold it on. Once that is removed you need to remove the DIC and you should be able to see what you need.
You may want to also check the fuse. Does the Security Light still blink? If not the fuse is your problem.
The four fuse slots are:
Hatch Auto (3)
Theft (15)
Blank
CINJ/CLU (5) (Listed as Crank in the Owners Manual)
The Theft fuse powers the horn relay.
Pink is hot from the fuse, Green goes to the horns, and black is ground which is grounded when the horn button is closed.
As mentioned above, you can test the horn relay by crossing green to pink after removing the relay to check the horns. A test light across the black and pink will allow you to troubleshoot the horn button or other grounding issue. I had the same issue but the answer was solved by replacing the horn contact wire.