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pechaaa
Samba Member
Joined: July 05, 2017
Posts: 38
Location: Europe, Latvia
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 Posted: Tue Aug 28, 2018 1:54 am Post subject: D+W -> tahometer signal ? How? |
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Hi, need help!
Soon I will get a speedo with tacho.
And at the moment I run 2.0L ADY engine with this generator- wich has D+W plug.
Question- is can i use this plug to get signal for my future tacho?
Thank you very much!!!
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?Waldo?
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Joined: February 22, 2006
Posts: 9752
Location: Where?
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| Posted: Tue Aug 28, 2018 7:43 am Post subject: Re: D+W -> tahometer signal ? How? |
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| On gasoline engines you do not need to (and really shouldn't) use the alt. I'm not familiar with your particular engine, but you can pull the ignition signal either from the ECU or from the ignition system. It is diesel engines that use the W signal from the alt because they do not generate an ignition signal. The diesel tachs operated by the W signal are different from gas tachs in their electronics in order to turn the W-signal into a useful rpm reading. |
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Vanagon Nut
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Joined: February 08, 2008
Posts: 10379
Location: Sunshine Coast B.C.
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| Posted: Tue Aug 28, 2018 11:43 am Post subject: Re: D+W -> tahometer signal ? How? |
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| pechaaa wrote: |
Hi, need help!
Soon I will get a speedo with tacho.
And at the moment I run 2.0L ADY engine with this generator- wich has D+W plug.
Question- is can i use this plug to get signal for my future tacho?
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Hi.
On my Vanagon with ABA 2.0 I connected my tachometer to " 1 " inside the ignition coil. Image showing how I did that (130 kb):
https://tinyurl.com/y9kue9ts
The ignition coil shown here (1995 European market "Golf")
https://volkswagen.7zap.com/en/rdw/golf/go/1995-159/9/905-905010/
looks similar to my ABA ignition coil. Internet images of ignition coil part number 6N0 905 104 indicate that it might provide access to the same " 1 " connection.
If you can post images of the ADY installed in your Vanagon T3, particularly any images of the exhaust and engine mounting, I think people might benefit from seeing them.
Thanks
Neil.
_________________
1981 Westy DIY 15º ABA
1988 West DIY 50º ABA
VE7TBN |
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pechaaa
Samba Member
Joined: July 05, 2017
Posts: 38
Location: Europe, Latvia
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| Posted: Wed Aug 29, 2018 12:28 am Post subject: Re: D+W -> tahometer signal ? How? |
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ADY using 1.6 diesel sump and motor support- easy instal.
Exhaust maniforld from 1.9 diesel
And intake from- 1.8 petrol engine?
And- I have these two connectors on my coil.
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Vanagon Nut
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Joined: February 08, 2008
Posts: 10379
Location: Sunshine Coast B.C.
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| Posted: Wed Aug 29, 2018 1:43 am Post subject: Re: D+W -> tahometer signal ? How? |
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thanks for those images and information.
Ok. So, the ADY coil has a different type of connections under the small cover. It is not like the ABA coil. Regardless, one of those soldered connections is " 1 " but even if you knew which one it was, soldering a new wire to it might be a poor idea, in my opinion.
As ?Waldo? suggested, there should be a wire from the engine computer (ecu) that would supply a tachometer signal but I'm almost certain that the output from that wire is not compatible with the Vanagon tachometer.
Neil.
_________________
1981 Westy DIY 15º ABA
1988 West DIY 50º ABA
VE7TBN |
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Vanagon Nut
Samba Member
Joined: February 08, 2008
Posts: 10379
Location: Sunshine Coast B.C.
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| Posted: Wed Aug 29, 2018 3:17 am Post subject: Re: D+W -> tahometer signal ? How? |
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Another idea. I edited one of your images to describe my idea.
Please refer to an ADY engine electrical wiring diagram to see if my idea is correct but on the 3 contact plug to the coil, wire from 1 should connect to vehicle frame (ground or "earth"), wire from 3 should be switched positive, wire from 2 might be a " 1 " signal connecting as an input to the engine computer.
With both connectors removed (dis-connected) from the coil, use a volt-ohm meter set to Ohms to measure for continuity between the male pin 2 on the coil and one of the soldered connection. If the meter shows continuity (0.00 Ohms), that might indicate that 2 is the " 1 " signal. If it is, it could be used for the Vanagon tachometer.
I hope that makes sense.
Neil.
_________________
1981 Westy DIY 15º ABA
1988 West DIY 50º ABA
VE7TBN |
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pechaaa
Samba Member
Joined: July 05, 2017
Posts: 38
Location: Europe, Latvia
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?Waldo?
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Joined: February 22, 2006
Posts: 9752
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| Posted: Wed Aug 29, 2018 11:06 am Post subject: Re: D+W -> tahometer signal ? How? |
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It's better not to use that much gasket sealer. A very light smear is just as effective, much easier to separate parts later, and doesn't run the risk of gobs of sealer coming loose inside the engine and causing disastrous things like blocking the oil pickup tube or blocking coolant passages. I've seen a head gasket issue caused by a gob of silicone getting lodged at the head gasket on an inline-4.
What's going on with your bell housing/transmission? |
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pechaaa
Samba Member
Joined: July 05, 2017
Posts: 38
Location: Europe, Latvia
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| Posted: Wed Aug 29, 2018 11:13 am Post subject: Re: D+W -> tahometer signal ? How? |
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| ?Waldo? wrote: |
It's better not to use that much gasket sealer. A very light smear is just as effective, much easier to separate parts later, and doesn't run the risk of gobs of sealer coming loose inside the engine and causing disastrous things like blocking the oil pickup tube or blocking coolant passages. I've seen a head gasket issue caused by a gob of silicone getting lodged at the head gasket on an inline-4.
What's going on with your bell housing/transmission? |
Thank you, I will pay attention to it.
I'm using diesel bellhousin/starter and adapter plate to renault gearbox. |
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?Waldo?
Samba Member
Joined: February 22, 2006
Posts: 9752
Location: Where?
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| Posted: Wed Aug 29, 2018 11:30 am Post subject: Re: D+W -> tahometer signal ? How? |
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| pechaaa wrote: |
| I'm using diesel bellhousin/starter and adapter plate to renault gearbox. |
Cool! |
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Vanagon Nut
Samba Member
Joined: February 08, 2008
Posts: 10379
Location: Sunshine Coast B.C.
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| Posted: Wed Aug 29, 2018 1:37 pm Post subject: Re: D+W -> tahometer signal ? How? |
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| ?Waldo? wrote: |
| pechaaa wrote: |
| I'm using diesel bellhousin/starter and adapter plate to renault gearbox. |
Cool! |
Agreed!
pechaaa:
What manufacture year is your Vanagon?
If you don't have a service manual with electrical diagrams for your Vanagon, this might help determine wiring to your instrument cluster:
https://docplayer.net/42857483-The-old-volks-home-...rofit.html
The Vanagon alternator D+ wire colour is blue. It should be present at the alternator and T14 connector to instrument cluster. At the alternator, that blue D+ wire should connect to D or D+ as shown in your image.
The Vanagon speedometer is mechanical only. No electricity is needed to make it work.
The images of the ignition coil look quite useful. If we assume your ADY has the same coil, it appears that I'm correct about wires 1 and 3 (GND and B+ in image you posted) but wire 2 (S+) may not be ok to use with the vanagon tach.
I'm being somewhat particular about this detail but its possible that B+ in the image you posted is actually 15 positive or what is sometimes referred to as "switched positive". i.e. you would only see positive (energized circuit) at that contact when key is turned to ignition on position. I am not certain of that though as i dont have a wiring digram for your engine.
I found a Russian web site that contains various service manuals. If you search the internet for "ady engine wiring diagram" you should be able to find it.
Please advise if my posts have too many words. 
_________________
1981 Westy DIY 15º ABA
1988 West DIY 50º ABA
VE7TBN |
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