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The clock has four wires going to it, brown, blue/white, black, and white/purple.

What wires can I hook up to test it?

There is no display at all. I thought it might have something to do with the radio since they messed up my wiring when they installed an aftermarket radio. I have most of that figured out and a real Ford AM/FM cassette to install once I figure out how the amp figures into the wiring I have left.

There didn't seem to be any common wires between the console and the radio but a bit of a tangle between the message center and the clock. Message center works so I want to test the clock.

How to test would be good to know if I have to replace it with others I find at flea markets and such.

Its a 1983 GLX Convertible that I have from the original owner and has 70,000+miles on it.

Thank you,
Justin
 

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Here's the wiring diagram for it. Looks like Black is ground, Blue/White is 12v, Brown is illumination/dimmer & I'm not too sure about the white. Hope this helps
 

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Thank you for this. I tried to test it by supplying 12V+ to any and all combinations of the three tabs that connected to power sources while leaving 12v- to the ground tab. Not a flicker of light to be seen on the display. It's a one owner car that I have known since day one and the clock and other components are cleaner than any replacements I have seen on eBay.

The hunt is on!

Justin
 

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try power to all three at the same time
 

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So the factory deck you have is a digital display ?
You will need 12 + , with key on , 12 + key off for the memory , ground , and 12+ for the lights /dimmer.
Key on can be acc. Or start position .
 
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