Author Topic: Add "W" terminal wire to Bosch/Valeo serp-belt TDI alternator  (Read 24591 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. 
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