Re: Fixing 68' SS Chevelle clock
To explain it a little more, the original clock is a mechanical wind up clock, not electric. BUT when it winds down a bit, a set of contacts touch and complete circuit to the electromagnet. When that energizes, it pulls a magnet which winds the clock (1/3 a turn or so, I forget) and opens the contact. When working it is a tick,tick clock like any wind up clock, and every so often, you will hear a "click" when it winds a bit.
From my limited experience, 2 of them mentioned problems are likely. Dirty contacts, or burnt coil. And also as described, as you set the clock forward or reverse, it alters the speed in that direction to make it self adjusting in a way.
If you get one running, try to set the clock in one continuous turning of the knob so you don't affect the speed as much.
If you pull it out, the first thing to do is look at the little latch thingy on the gear wind thingy and the contacts. If they are closed, push them open and wind the clock maybe ¼ turn. Then give the tick wheel thingy a nudge and see if it spins back and forth. If it looks like it is running, wait till it stops and do that again a few times. If it runs OK, then figure out why the electric winding part doesn't work. A 9v battery will keep one running for a long time.
1967 El Camino Malibu - Deepwater Blue
ZZ4 350, FiTech 600 complete!,Roadmaster tank, 700R4, Underdash A/C in progress, JGC Steering, 1990s truck serpentine.