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john 33_16v · Posted: Wed Dec 04, 2013 5:56 pm Post subject: Speedo sensor info

Hi,

I've scoured the manual but I can't find the following data.

If anyone knows or could unclip the bulkhead plug on their s3 to find the following I'd be really grateful.

1) Voltage at car/instruments side of plug
2) Resistance on the sender side of the plug.

Cheers,

John
_________________
If it aint broke, fiddle with it until it is!
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93 33 16v Mirtle Met
08 Fiat Grande Punto Exotica Red
90 Yamaha FZR600 Genesis- Silky white/red/blue

Joelomint · Posted: Fri Dec 06, 2013 12:19 pm Post subject:

no idea mate,

but there is a specific wiring supplement for S3 cars here:

http://alfaromeo33.extra.hu/

Does that help, or have you exhausted this avenue already?

john 33_16v · Posted: Fri Dec 06, 2013 12:43 pm Post subject:

Thanks.

I just wanted to know if the values I'm getting were correct before I start taking things apart. The voltage 'clocks side' of the bulkhead plug is very low.

Speedo just started doing the old intermittant thing then died, and I checked the bulkhead plug connections and even fitted a NOS sender I'd had in the garage for about 7 years to no avail.

John
_________________
If it aint broke, fiddle with it until it is!
- - - - - - - - - - - - - -
93 33 16v Mirtle Met
08 Fiat Grande Punto Exotica Red
90 Yamaha FZR600 Genesis- Silky white/red/blue

eagle3 · Alfa 33 Joined: 11 Nov 2007 Posts: 402 Location: France

It's electronic so I would imagine the voltages are low anyway.

When the speedo starts doing that it's usually soldered joints in the speedo itself that fail I think.

ZP did a thing on them on his (french) Imola site http://alfaimola.free.fr/technique/electricite/compteur/index.html
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Alfa33 QO 1984
Alfa33 1.3i.e. 1994