Dave, the horns are grounded through the horn housing were it bolts to the hood latch. The first horn (drivers side) has two wires on the plug, one Dark Green positive wire (from horn relay) and the other wire goes to the pass horn. To test horns disconnect wire from horn, leave it bolted to car and jump positive batt lead to horn male connector. Make sure good ground at hood latch. If it doesn't work, horn is dead (they can re-built from a kit by Zip Corvettes). If it works, the problem is either broken connection at steering hub or horn relay. Get a wiring diag and trace wires with ohm meter.
Backup lights are controlled (I assume you have a stock Z/28) via a linkage that goes from the reverse lever on the trans through a bellcrank on the frame to the steering column linkage. The linkage is attached to the steering sleeve (this part moves, it's between ignition lock and dash cluster. The reverse light swith is mounted on the upper part of column right above the brake pedal and is activated by the sleeve rotating. Check to see if all of that is hooked up and when you shift into reverse you should feel the lower part of the steering column rotate. Good Luck, Kevin
Oh Yea, your reverse/steering column lockout also works via the linkage. So if you are able to lock the column and get your key out without putting it in reverse, then the linkages are not hooked up.
69' SS-350 ragtop, M20, 3.55 posi. Totally Disassembled & in boxes (I'm working on it!)
69' Hugger Orange Z-21 ragtop 327/PG, Driver
[This message has been edited by KevinW (edited 04-11-2001).]
[This message has been edited by KevinW (edited 04-12-2001).]