Tachimetric sensor + acustic buzzer

the white thing looks like a chunk of C4. be glad someone cut the purple wire!

 

Does it make the fasten seat belt buzzer (item 8) work? Not unreasonable to cut.

 

Are you sourcing a problem or just sorting things out?

Cheers

 

And I thought everything worked on my car. Didn't know there was a buzzer. That may be a problem I will not search out.

I like how it says ARABIA in your first picture. Mine has USA written in paint on rear suspension pieces. I also found Cabriolet scribled on tape inside one of my door panel pieces a few weeks ago. It's fun to find builders notes 23 years after construction.

 

Some wild guessing...

From Ricambi's illustration it is common to both the ABS and non-ABS vehicles, so I think we can rule out some sort of ABS failure alarm (there are tach. sensors for detecting a difference in wheel speeds on ABS equipped cars, generally speaking). Part number 1 in the illustrations is for "SA" only, "Saudi Arabia" I think in this case. Probably a response to a regulatory compliance issue in that country.

Was the car "federalized" when brought into the US? A registered importer doing the conversion might have had to change the way something like a seat belt alarm worked in order to meet the NHTSA specification. Maybe this has something to do with that.

The only tachimetric sensors I can think of on these cars are one for the speedometer, one for measuring engine RPM and two wheel sensors on ABS-equipped cars.

Perhaps this just sounds the buzzer when a certain speed is exceeded?

A wiring diagram would tell us a lot more, but finding the one that pertains to a specific market might be difficult (I couldn't find anything referencing it).

Charles

 

Wade, where is this? Drivers side under the dash somewhere?

 

Wade:

If it has only three wires and isn't achieving a ground connection through the mounting screws, this would suggest that the wires are power, ground and an input signal. If this is the case, then it's simply some sort of alarm/annunciator. If it is getting ground through the mounting hardware, then it might two multiple inputs or an output signal as well.

Short of extensive poking around with an ohm meter (with bat. disconnected) I don't see a simple way of sussing this out.

If I owned the car my concern would be where the other end of the blue/black wire is... I wouldn't want that thing to inadvertently short to ground if its carrying a signal. I would find the other end, put a piece of heat shrink over it and forget about it.

You might want to ask in the Middle East forum, maybe someone with experience in SA regulations could shed some light on it.

Lastly, my comment about federalization was to suggest that maybe the US importer disconnected it.

Let us know what you find out.

 

Wade,

The wire was cut for a non-factory buzzer install.
GT Car parts can help,, they can send you a factory bulletin.
(I can't find mine....)

Good luck,
Edwardo

 

Wade:

Looks like the sticker says it all. Speed buzzer... just lets you know when you're driving in excess of 120 km/h.

Googling "120 kph saudi" returns many relevant hits.

I would still put a piece of heatshrink tubing on the cut end of the wire in the bundle, just in case the speedo sensor has an unbuffered output signal on that wire that might not like accidental grounding.

Interesting.

 

Wade,

The Blue-Black wire is definitely 12V power.
(I believe, before your buzzer install, it was used to power the whole, "ON" ignition circuit group, and flip to On, some Relays.) Thus, it needed to be cut to prevent a Short in the "On" circuits. Using it for the radio power is pure ingenuity, but still wrong.


And, I found a paper copy of my Bulletin,, used to install a 3.2 Fuse box in a Mondial-8.
It is relevant to all Mondials up to the 3.2,, for I use your fusebox.

Ferrari service Bulletin No 80-26
SB 80-26 4-20-87
Subject: Electrical Board Replacement
Vehicles: Mondial 8 (U. S. Version)


Good luck again,
Edwardo
1981 Euro Mondial-8