Author Topic: Add "W" terminal wire to Bosch/Valeo serp-belt TDI alternator  (Read 22662 times)

Reply #15September 25, 2014, 11:51:40 am

rodpaslow

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Re: Add "W" terminal wire to Bosch/Valeo serp-belt TDI alternator
« Reply #15 on: September 25, 2014, 11:51:40 am »
Yeah, I have an alternator that has the W and installed it last night - was from the 2.0 ABA.  Works fine.  I have a new VDO tach, just have to set the pots later today and also has a potentiometer so if it's off a bit I can adjust it.  I bought a cheap china electronic hand held tach, Just add a piece of it's reflective sticker to the crank and it tells speed - seems like it works well enough.  Will adjust the VDO to match it - cause I hate not having a tach.

Thanks for the help!
99' 1.9 1Z Tdi, hybrid pump -1.9 housing & rover internals, 2052 wastegate turbo,.25 hflox nozzles, SDI intake, CTN tranny
96' 1.6 TD Golf, Giles pump, VNT 17, Gas changed to Diesel, Air to Water Int.

Reply #16September 26, 2014, 12:07:46 pm

rodpaslow

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Re: Add "W" terminal wire to Bosch/Valeo serp-belt TDI alternator
« Reply #16 on: September 26, 2014, 12:07:46 pm »
I now have a working tach -  current idle is about 786, by my cheap china hand held, so I set it to just below the 800 mark.

W alternator is so much easier than finding a winding before the doide on this type of alternator - in my opinion.  I'm have virtually no electronics experience ...
99' 1.9 1Z Tdi, hybrid pump -1.9 housing & rover internals, 2052 wastegate turbo,.25 hflox nozzles, SDI intake, CTN tranny
96' 1.6 TD Golf, Giles pump, VNT 17, Gas changed to Diesel, Air to Water Int.

Reply #17January 11, 2016, 09:01:47 pm

rotaecho

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Re: Add "W" terminal wire to Bosch/Valeo serp-belt TDI alternator
« Reply #17 on: January 11, 2016, 09:01:47 pm »
I'm also getting ready for a mTDI (AHU) conversion in my Westy as well and was looking for an alternator that would mount to the block that would accept the W terminal.

Reading this post the AL0184X would be a good way to obtain the W terminal.

I have the following questions:

Does this alternator have the same/similar RPM setups for the diesels?

What is required for getting the proper Tach RPM's setup for an mk2 (CE1 diesel tachometer?) configured properly for RPMs? Should an m-TDI AHU idle around 750?

Thanks! Really hoping to get a tachometer solution figured out for my conversion.
-Will
1982 Westfalia 1.6na diesel aka Betsy Bertha The Tortoise

Reply #18January 22, 2016, 02:19:08 am

vanbcguy

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Re: Add "W" terminal wire to Bosch/Valeo serp-belt TDI alternator
« Reply #18 on: January 22, 2016, 02:19:08 am »
I have the AL0184X on mine... Works fine.

The tach you have should just plug in and work if it's for a diesel.  No magic... Not sure if there is an adjustment on those older ones, I don't think there is.  The tach will be approximately right though.
Bryn

1994 Jetta - AHU M-TDI - Jezebel Jetta
2004 Jetta Wagon - 1.8T - Blitzen

Reply #19January 22, 2016, 09:20:21 am

libbydiesel

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Re: Add "W" terminal wire to Bosch/Valeo serp-belt TDI alternator
« Reply #19 on: January 22, 2016, 09:20:21 am »
There is an adjustment pot in the circuit of each of the tachs back to mk1.
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Reply #20February 11, 2016, 10:52:08 pm

rotaecho

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Re: Add "W" terminal wire to Bosch/Valeo serp-belt TDI alternator
« Reply #20 on: February 11, 2016, 10:52:08 pm »
Thanks Libby, sounds like a better option for a mTDI setup would be using the AL0184X with the W terminal. That way there's no prying off the plastic back and soldering a wire to a stock TDI alternator.

There is an adjustment pot in the circuit of each of the tachs back to mk1.
-Will
1982 Westfalia 1.6na diesel aka Betsy Bertha The Tortoise

Reply #21April 05, 2020, 12:06:47 pm

Achilles3588

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Re: Add "W" terminal wire to Bosch/Valeo serp-belt TDI alternator
« Reply #21 on: April 05, 2020, 12:06:47 pm »
Swapping a 1.6 TD JX for a 1.9 mTDI AFN in a '91 Syncro Doka.

The bright shiny new Bosch Alternator Model No. AL0723X that came with the AFN does not have an explicitly W signal, rather B+, D+ and finally DF. I have seen pics above of the AL0184X where the W connection is exactly where the 0723X places the DF in a two pin connector. When looking at AHU wiring schematics it appears the DF signal is effectively equivalent to the W but that's a simplified schematic and is without looking at the alternator internals or the mfr's internal schematic. Does anyone know if the connecting the JX's W wire to the alternator's DF terminal will accomplish the tach signal objective? I don't want to void the warranty on the new alternator by making the above mods.
'91 1.9L TDI 'AFN' Syncro Doka

Reply #22April 05, 2020, 08:13:35 pm

libbydiesel

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Re: Add "W" terminal wire to Bosch/Valeo serp-belt TDI alternator
« Reply #22 on: April 05, 2020, 08:13:35 pm »
The AHU alternators I have used have had the W terminal as a marked connection.  I have not used an AFN alt. 
Use, abuse or ignorance of any information is at your own risk, confirmation or refutation is your own responsibility, no further 'proof' will be given, take it or leave it, YMMV,terms subject to change without notice, avoid contact with eyes or skin, contents known to cause cancer in California