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Discussion Starter · #1 ·
The older ones had an analog clock, I have newer style digital unit in my 1980
There are 4 wires that come out of the clock
If I keep probing the right combination of wires with a 12V source (find the + and -)
....will it light up so I can know if it works?

Just wondering if anyone has ever fiddled with one of these
Bought one off of flea bay and it is also dead

Wondering if problem is with the pwer feed to the unit or the clock itself
The other 2 gages in the pod are fine
 

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1983 280zx n/a 5-speed t-tops
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I have been working on a JY meter pod for fun. The digital clock wires are powered like this (colors are for clock wires):

Black = negative 12V
Blue/White = Positive 12V from fuse block, powered all the time
Blue/red = Positive 12V from fuse block, powered only when key is on
Green/White = from light dimmer control, dimms clock at night when lights are on

The other pins control pod lights, oil and amp lights. The challenge with the service manual diagrams (pg EL 90 in the 83) is that they only show the car side wire colors which are oftentimes different than the component wire colors.

For the digital clock, you need the negative and both positives connected in order to see digits. If you don't see digits there is something wrong internally with the clock.

The one in my 83 illuminates sometimes when it feels like it. The JY spare doesn't illuminate. So I'm going to practice and see if I can resurrect it by replacing caps and/or transistors and resistors.

These are notorious for being wonky.
 

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Discussion Starter · #3 ·
This is awesome!

So if I am bench testing this unit, (testing before I put it in the dash)
I take the 2 blues and connect to +12V
Take the Black and connect to - 12V
....and I can just leave the green one if I like?
 

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1983 280zx n/a 5-speed t-tops
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Yes, thats right. Hopefully it will work. If it does not you'll have to troubleshoot the electronics. I'm working on one right now to figure out the basic schematics to see if I can restore them to working condition. I'll let you know what I find out.
 

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Discussion Starter · #5 ·
I tested the unit per you info and it looks like it works !
You could probably corner the market if you find out how to fix them
Working digital clocks are like unicorns
 
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