Dash clock
Hi, if any help, I have taken the same clock as you have from my 57 Bel Air, it was not working when I bought the car, so I took mine apart,
So here goes, the time adjuster knob is removed by a quick flick turn anti clockwise, its got a clockwise thread on it! as you adjust the time, it tightens up the knob! if it wont budge, dont pull it in any way, just a slight spray of WD40 and keep trying, inside is a sprung wound relay with a set of contact points inside, just like a dissy! as the spring unwinds, it makes contact with the points, that makes a circit, and it rewinds again and again, the clocks 9 times out of 10 are found to have the spring broken, and the points burnt out! and they are unrepairable unless you are clock or watch maker!and the springs and points are harder to find than winning the State Lottery! Danchuk do a replacement clock the same as original, but very, very expensive, or a digital look a like, at a fair price,
Right now to test the clock,,,, just hook up a live wire from a spare battery, or from your car, to the one wire coming from the clock and earth (ground) the casing, if it is going to work give it a light tap to get it started, you will then hear the spring start to wind up! if it dont its bust! you can look inside and see what I am talking about, but I bet you say "no way" and leave it.
My spring was ok, and the contact points just dirty, so a light clean, slight WD40 and its perfect, BUT I have never connected it up as an every day clock, it just sits there in the dash, I know its working, and thats how its staying, to find a good working one is as hard as finding your wife changing the engine oil! good Luck, Johnny G,
from the UK, of all places to know about Chevy dash clocks, its a small world!