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Engine Specific Info and Questions => IDI Engine => Topic started by: Powered by Spearco on January 12, 2009, 10:15:20 pm

Title: AAZ Alt.
Post by: Powered by Spearco on January 12, 2009, 10:15:20 pm

Just wondering if the alt. from an AAZ has a W terminal. Also would an Alt. from a MK3 TDI or gas have a W termnial if used with a MK2 dash cluster w/ tach. Or are they controlled by the ECU.

Title: Re: AAZ Alt.
Post by: Vincent Waldon on January 12, 2009, 10:22:46 pm

Quote from: "Powered by Spearco"

Just wondering if the alt. from an AAZ has a W terminal.

Yup.

Quote from: "Powered by Spearco"

 Also would an Alt. from a MK3 TDI or gas have a W termnial if used with a MK2 dash cluster w/ tach. Or are they controlled by the ECU.

Probably depends on the supplier (ie they might just stock one alternator for all applications) but likely not... gasser's don't need it and the TDI reads RPM from the engine crank sensor.

BTW, the AAZ alternator uses the serpentine pulley and it's a different diameter than the MK1/2 alternator, so if you were to use an AAZ alternator and pulley to drive a MK2 cluster some recalibration would likely be required. :wink:

Title: AAZ Alt.
Post by: Powered by Spearco on January 12, 2009, 10:33:48 pm

How do I calibrate it. Is there a dash pot in there somewhere. Or is there some soldering to be done.

Title: AAZ Alt.
Post by: regcheeseman on January 13, 2009, 03:10:39 am

you can hook a W term onto most alts - a wire to one of the windings will do the trick.

the revcounter has a cal pot on the board.

Title: AAZ Alt.
Post by: Sam Johnson on January 14, 2009, 10:47:22 am

All,

I just installed a Mk II diesel tach I purchased from Dr. Diesel in the cluster on my 1988 Vanagon that now has a AAZ 1.9 TD engine.   This was connected via the standard cluster wiring to the W terminal on the Alt.  It fits in the Vanagon cluster like stock and works like a charm.  However, it reads around 1600 rpm when the engine is running around 1000 rpm.  

In this regard can anyone tell me what direction, clockwise or counterclockwise, I need to adjust the cal pot on the circuit board to bring the reading closer to the actual one?  As a I am also running an industrial tach, kind of like a Tiny Tach, off the W terminal I do have an accurate reading available to use to calibrate the diesel tach in the cluster.

Thanks for any suggestions and responses.

Sam
Tucson, AZ

Title: AAZ Alt.
Post by: juleshs on April 05, 2009, 10:12:57 am

does anyone have pics of alt with w terminal i dont have a clue what im looking for

Title: AAZ Alt.
Post by: burn_your_money on April 05, 2009, 10:42:59 am

On a mk1/2 alt it's a male spade teminal usually pretty close to the center of the alternator. It's on the non drive (pulley) end. There should be a W stamped pretty close to it

Title: AAZ Alt.
Post by: juleshs on April 05, 2009, 11:01:00 am

this is a mk3 alt with serp belt

Title: AAZ Alt.
Post by: Vincent Waldon on April 05, 2009, 11:13:56 am

On the AAZ alternator:

- the big B+ cable bolts on to a stud
- the W-terminal and D+ lines plug in (using the standard MK3 VW two-pin connector) at the bottom of the alternator... "bottom" being defined when the alternator is bolted to the block.