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Capacitor on the back the clock...

Old 10-12-2018, 03:22 PM
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Default Capacitor on the back the clock...

On the back of the clock there was this capacitor with the running end tucked under the clock's rear cover.

Is that supposed to be there?


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Old 10-13-2018, 03:10 AM
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I'll take a stab at it.
My 74 didn't have a capacitor there, but I would imagine that it is there to maybe stop the "pop" in your radio when the clock coil is energized. Or maybe when you turn on your marker lights.
That's my best guess.
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Old 10-13-2018, 03:19 AM
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For a capacitor to work it need to have two looks like one is missing in the picture. Is it possible that a lead has broken off on the left side of the capacitor (or next to the existing one)? Someone may have attached it at one time to try to filter out some noise and attached that one visible lead to ground at the clock. See if you can find another wire hanging out somewhere.

Edit: I remember that some capacitors had the case as the ground so maybe that lead wire is just miss-connected or going to a spot that is not ground.


Last edited by Redvette2; 10-13-2018 at 11:15 AM. Reason: Update Idea
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Old 10-13-2018, 09:01 AM
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Originally Posted by DorianC3 View Post
...Is that supposed to be there?...
Yes if your car had the optional radio. The AIM shows the RFI capacitors.. There are several of them in various locations.
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Old 10-13-2018, 01:00 PM
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Old 10-13-2018, 05:27 PM
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I suspect that the attachment band is connected to second capacitor line and to electrical ground via the gauge housing. If your stock mechanical-electrical clock no longer works, or it has been replaced with a quartz movement clock, or your radio has been upgraded to a modern unit, then you don't need to replace it. Just leave it as it is.

Last edited by 7T1vette; 10-13-2018 at 05:29 PM.
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