There is an adjustment underneath where the switch is bolted onto the bracket.
Make sure the actuating rod is doing its job when in reverse and out of reverse. No rod? I made one from a metal clothes hangar.
The switch has slotted holes for adjustment. Back your car up to the garage door at dusk, jack up the side and place jack stands underneath. Turn key on, take 5/16 inch wrench, crawl underneath and adjust for lights off in neutral. Check to make sure they come on in reverse. Job done.
When you shift out of reverse, you should see the outer shell of the steering column rotate (down by the lower dash). If your interlock is working correctly, you should not be able to remove the key unless the trans is in reverse.
The backup light switch on a '69 is on the steering column inside the car. That's one of the reasons for the extra linkage. The switch could be bad, or as in the case with mine, the linkage was missing at one time and someone hooked them up to a toggle switch. I'm not positive but I think they're two pink wires. My car's 10 blocks away so I can't look. The Tremec 5-speed I put in mine has a backup switch built in which solved that problem.
1 2RUN and Mr C are correct. Get way down at the base of the steering colomn and feel for that white plastic switch located on top of the sterring column. It's held in place with two little screws and two pick wires connect to it. Chances are the switch is worn out. Good luck!
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