Ferrari Mailing List: Re: Keeping busy with Ferrari stuff

[Rick Moseley (ramosel]

Do all four wires have path to ground?

I think you are right on your assumptions.   It wasn’t uncommon in that era for clocks to have an “always hot” leg to run the clock when the key was off, a “switched hot” to drive the display, backlight and ground.  Backlight is usually, especially if incandescent, on the common dimmer circuit.  If you change the backlight to LED, you may need a PWM circuit to control brightness.   Doable, but might be better off just putting a new bulb in while you have it out.  

Unlike modern LCD clocks that will run for a year on a couple of AA batteries (backlit on a couple of Cs), the older clocks were vampires.  I’ve worked on a few other different makes that were intentionally sabotaged to keep the car battery alive on cars that were parked for long periods of time. Yes, some guys prefer a dead clock over one that has to be set all the time when using a battery disconnect.  Take a close look to see if there is something obviously missing. Even just a pin pushed back in a connector.    Gotta be someone on Chat or Life that has a car close to yours who can get you pictures. 

On Jan 19, 2022, at 8:33 PM, Peter Rychel <dino308gt4 [at] hotmail.com> wrote:



Anthony wrote:

 

“Do you have the wiring diagram for the car and a picture of the connector in the clock.  It would be easy to deduce it from there.  If not, we could ohm things out and do process of elimination.

 

Charles wrote:

 

"Correct. This is his website:

 

http://www.ferrari308gtbi.com/Wiring308.php

 

If memory serves, I don’t think anyone has Mondial diagrams. I think they are a 90% match to the equivalent 3-series car, so Paul used to tell people that with a few exceptions, the same year 308 diagram was the way to go.”

 

 

 

 

Thanks guys, but the T was quite the departure from any previous model and differs a lot from the 308/328 series (I’ve got most of them, including Paul’s on my desktop).

 

I have the wiring diagram for the 3.2 Mondial (it came with a bunch of manuals I got a long time ago, before I got my Cab) and it doesn’t come close to matching.

 

There’s only four wires and I checked continuity. Keep in mind, the battery is disconnected at the shut-off switch (Batt neg pole). All four wires show levels of resistance, the black wire being the least – my guess it’s ground. I know one wire must supply continuous power so the clock can keep memory. Another wire must be the one that light’s up the bulb which would come on when the ignition is turned on. The other wire may be a dimmer function (?), although when I turned the dimmer knob, nothing changed. At least with the key in the off position…

 

I’ll take a closer look at the 3.2 drawing which also has four wires, but all of them are different colors. Makes sense because the clocks are made by different manufacturers. The earlier cars may have been made by Veglia, this one is marked Jaeger.

 

Peter

 

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