I'm sure this topic has been covered before,but the archive is so massive that it's hard to find exactly what i'm looking for.I recently picked up a new interior for my F100 out of an 82 F250.The new interior came with a factory clock,and as usual,the clock wouldn't work.I took it apart,and sprayed it down with some contact cleaner.Put it back together,and still nothing.When I took the clock apart,it looked really clean inside,nothing was dusty at all.Is there something i'm missing?I really am not sure how to use the clock,or which buttons do what.Would pressing the Reset button help?Or do I need to take it back apart and try to clean it more?I could understand it not working if it was all corroded inside,but it looks brand new.Any help is greatly appreciated.Thank you.

 

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Clock installation
The four CLOCK connections needed are 1) grd; 2) hot always 12v for memory; 3) 12v Power with key on; 4) 12v from headlights to dim display at night when lights are on.
For bench testing 1) 2) & 3) are needed, both 12v inputs are needed at the same time.

Ground is Black on both sides of the wire connector.
Hot always 12v on Clock side of the connector is a RED wire; on truck side it is green with a yellow stripe.
12v key on power is Green on the clock side and White with Purple stripe on the truck side (or yellow/black).
12v dimming wire is White on the clock side and Brown on the truck side (or blue/red)

Jim

 

Thanks,but i'm kinda new to bench testing things,so what exactly should I do to set it up?

 

Quote:

Originally Posted by Fordzilla80

Thanks,but i'm kinda new to bench testing things,so what exactly should I do to set it up?

Connect power & ground to all of the right places and see if it works.

Come installation time, I suggest the dash or heater control backlighting and not
the headlights; the low-wattage lamps are dimmable (via the headlight ****) and
so is the clock.

 

The factory plugs for the clock are already waiting right under the dash. To the right and beneath of the heater controls, hooked to the bottom of the dash.

Did you just plug the clock in at the supplied connectors and it didn't work?

Does your dome light work?

The clock uses the courtesy lamp circut, Lt. Green/Yellow stripe for clock memory, and also uses Keyed power, White/Purple wire, coming from the fuse box.

Both have to have power for the clock to work.

Check the fuses in the fuse panel.

F-11 = Accessory Feed... 10 amp
F-8 = Courtesy Lamps... 15 amps

Then check for power at the white/Purple wire, and the Lt. Green/Yellow wire at the clock connector on the truck with the key in run or accessory position. This will eliminate a problem on the truck side.

Since this clock comes out of a 1982, you can hold the time button while the ignition is off to read the time, does it work if you try that? The backlamp in the clock could also be blown. Shine a light on it, can you see a hint of numbers in the display?

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On 1980-1982 clocks, you pull the date or time buttons out, (Just like on a push button radio) to set them. Make sure that the date, and Time buttons are not pulled out at the same time. Press on them to make sure they are engaged. Having both pulled out will make the clock read all 88:88 's or malfunction.

1983-1986 clocks are different and are not set or work like above. (Mentioning this to try and eliminate confusion if people were wondering)

 

Yes,plugged it in and had nothing.

Yep,all the lights work.


All the fuses are good.

That was my next course of action.I'll go out now and check that,and post what comes up.

I can see the numbers with the light.

That's exactly what I was needing to know,Thanks.I have no idea how to work the clock.lol.

 

Ok, what does the numbers say? Are they all 88:88 's etc...

Does it flash on and off in a pattern, just with no backlight, or are you just seeing the display shine back at you?


it will be very hard to see, but the display will darken and brighten slightly if the LEDs are working without the backlight.

Press the time button and date button to make sure they are engaged, as said earlier.

 

All I can see is 88:88.It's as if the clock is unplugged.I'm waiting to pull my battery off the charger to see if i'm getting power to the harness extension.I'll post up what I find.

Oh and all the buttons engage,and the little copper strips make contact with the contact dots on the circuit board.I can't see any corrosion or any reason why this thing wouldn't work.

Thanks for all the help man.

 

The photo JimsRebel posted shows it has a vacuun florscent display, not a back lite unit. So shining a light into it will not show anything. Only way is verify all nessary voltages to the harness, if they are good, then the clock is probly dead. If you are inclined you could componet repair the clock pcboard. But its probly better to get another one from the junkyard(if you can find them now days)

 

There are two different clocks.

One for 1980-1982

One for 1983-1986

The internal workings, and the way they are programed and how they function is different, although they do look simular.

The 1983-1986 has the vacuum florecent display, and the display is dimmed by the clearence lamps brown wire. The brown wire has 12 volts constant power with the headlamps on, and the circutry in the clock makes the display dim with 12 volts applied to the brown wire.

The 1980-1982 clock is backlit, and it uses the Lt. Blue/Red wire that is also used for cluster illumination for dimming the display. The voltage on the Lt. Blue/Red wire is variable, and controls the amount the Instrument cluster, the radio, the ash tray light, and the clock dims by turning the headlamp switch **** either right or left.

 

Well,I hooked up the test light today,and here's what I got.

The Light Green/Yellow wire has power all the time,the light shines no matter what.

The White/Pink wire shines only when truck is on Accessory.

The Black Wire which I presume is ground has no light

Light Blue/Red has no light either.

81 Explorer,in your last post,you said the Light Blue/Red wire goes to the Instrument Cluster.The Instrument Cluster is currently out of my truck due to a broken snap button on the printed circuit.Does the Cluster need to be plugged in in order for the clock to work?

 

Try turning ON the headlights, then check the Light Blue/Red wire

I have read that you can test the display at the junk yard with a nine volt battery to see if it turns on/lights up. If you dont want to go to the junk yard I have a spare board that works.

Jim

 

Nothing with the headlights.

 

As Jimsrebel said above, The Lt. Blue/Red wire is only energized with the light switch in the on position.

The instrument cluster does not need to be plugged in, however the 5 amp fuse in the panel must be good for the circut to work.

Also make sure the headlamp **** is turned toward the left, as this controls the dimming of the instrument cluster, radio, clock, etc... If it's turned all the way to the right it can be too dim to see in sunlight or read without a meter.

It does sound like the clock is DOA. You could also check the clocks harness extention for a break in it's wiring, having it plugged into the main harness, while the clock is unplugged at the other end. If you hadn't thought of that already.

 

Check the 5 amp fuse in the panel, and make sure the **** is turned to the left.

If still no power you need to check for power at the Lt. Blue/Red wire at the headlamp switch with it on, and turned to the left. If you got power there, then the problem is in the wiring between the clock and the headlamp switch.

If no power at the Lt. Blue/Red wire, at the headlamp switch, then most likely the headlamp switch is defective.