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Engine Specific Info and Questions => IDI Engine => Topic started by: numbnuts on August 13, 2007, 09:39:35 am

Title: GTD Rev counter not working
Post by: numbnuts on August 13, 2007, 09:39:35 am: Hi guys, i have traced a broken wire down to the red/ black on my aternater. Does anyone know which terminal it should be soldered onto? There seems to be a choice of 3 on the alternater, if its possible to make out on the pics.....
(http://i115.photobucket.com/albums/n319/numbnuts75/100_0267.jpg)
(http://i115.photobucket.com/albums/n319/numbnuts75/100_0265.jpg)

Hope someone knows as i really want this working. :?

Thanks alot, Joel
Title: GTD Rev counter not working
Post by: Demons UK on August 13, 2007, 10:18:17 am: Duno if these help mate but?

(http://img102.imageshack.us/img102/6567/13082007083ad1.jpg)

(http://img409.imageshack.us/img409/9537/13082007084zz9.jpg)
Title: GTD Rev counter not working
Post by: Vincent Waldon on August 13, 2007, 11:06:45 am: Yup, the tach is driven off the W terminal which is usually a red/black stripe wire with a spade lug (rectangular push-on).. the other two (B+ and D+) are circular bolt-on connectors.
Title: GTD Rev counter not working
Post by: numbnuts on August 13, 2007, 01:59:05 pm: Ok, the black/red wire plugs into the W terminal, but behind that is a lilac wire and that is soldered onto the alternater somewhere. It looks long enough to reach one of the 3 terminals with 3 red wires fixed to them, 1 on each. See pics :?

(http://i115.photobucket.com/albums/n319/numbnuts75/100_0271.jpg)
(http://i115.photobucket.com/albums/n319/numbnuts75/100_0274.jpg)
(http://i115.photobucket.com/albums/n319/numbnuts75/100_0275.jpg)
Title: GTD Rev counter not working
Post by: Vincent Waldon on August 13, 2007, 02:52:58 pm: Ah... the broken wire is *inside* the alternator....

I believe it matters not which of the three terminals internally you go to (although you may be able to detect remnants of the broken wire)... basically it's just picking up one of the 3 phases from the diode bridge.. probably doesn't matter which phase.

I have an alternator schematic with the W terminal labeled... will edit this post if I can find it.

Vince
Title: GTD Rev counter not working
Post by: numbnuts on August 13, 2007, 03:07:12 pm: Yeh, i was willing to give it a go on any of them and find out if it worked :lol:
My mate said he wouldn't hold it on though whilst the engine was running :lol:
Title: GTD Rev counter not working
Post by: Vincent Waldon on August 13, 2007, 03:42:28 pm: Someone I know was timing a gasser and thought you twisted the crankshaft pulley to adjust where the mark was (rather than the distributor) while the engine was running...after all, it looks like it's standing still when being illuminated by a timing light.
Title: GTD Rev counter not working
Post by: Vincent Waldon on August 13, 2007, 06:55:46 pm: Here's the alternator schematic:

(http://i197.photobucket.com/albums/aa85/vwaldon/W-terminal.jpg)
Title: GTD Rev counter not working
Post by: numbnuts on August 14, 2007, 09:12:54 am: Thanks alot, i am about to solder it when it stops raining :roll:
Title: GTD Rev counter not working
Post by: Vincent Waldon on August 14, 2007, 09:20:18 am: Which, in England, will be sometime next summer ??!!!! :lol:

Vince
Title: GTD Rev counter not working
Post by: numbnuts on August 14, 2007, 02:11:25 pm: you are not wrong :roll:
Title: .
Post by: zooky on August 14, 2007, 06:10:43 pm: what kind of output is 'W' putting out, I was getting a constant 9VAC. Am I looking for a Hz output?
Title: GTD Rev counter not working
Post by: Vincent Waldon on August 14, 2007, 06:48:30 pm: Yup, it's a sine wave at about 10x the frequency an ignition system would be putting out... hence the difference in the tach/cruise/oil warning systems between diesels and gassers.

Vince
Title: GTD Rev counter not working
Post by: Jimmy Diesel Junior on November 29, 2008, 01:21:46 pm: hi all i fitted vw taco into my mk2 but they're not working. If i have a w-terminal on my alternator, how do i connect this to my taco to get it working?????
Title: GTD Rev counter not working
Post by: Jimmy Diesel Junior on November 30, 2008, 10:17:26 am: anyone know about this??? cheers
Title: GTD Rev counter not working
Post by: arb on December 01, 2008, 08:54:30 am: Quote from: "numbnuts"
Thanks alot, i am about to solder it when it stops raining :roll:

The thing about soldering on anything that viborates is you must strain relief the wire after the connection or the wire will crack at the edge of the solder joint. That is why on cars nearly all wires are crimped - the crimp is the strain relief. Yes, solder is a better connection electrically, but imobilze the wire right after the solder if you want it to last.
Title: GTD Rev counter not working
Post by: regcheeseman on December 01, 2008, 09:59:13 am: Quote
anyone know about this??? cheers

Yeah, a little bit :lol: what revcounter are you running? Have you looked at my revcounter thread in the FAQ section?
Title: GTD Rev counter not working
Post by: Jimmy Diesel Junior on December 01, 2008, 01:13:39 pm: Hello and thanks for your reply. I haven't looked at the FAQ but i will now. I'm using vw jetta turbo diesel clocks. Any ideas why it's not working or what i can check for.
Title: GTD Rev counter not working
Post by: regcheeseman on December 02, 2008, 04:13:07 am: Quote
hi all i fitted vw taco into my mk2 but they're not working. If i have a w-terminal on my alternator, how do i connect this to my taco to get it working?????

You need a connection between altenator w terminal and revcounter for it to work.

Whatever your mk2 is, if it was a gasser, find the revcounter signal wire that was original connected to dizzy/ignition coil and run it down to the alt w term - that should sort it.
Title: GTD Rev counter not working
Post by: Jimmy Diesel Junior on December 02, 2008, 10:47:58 am: Hello. The rev counter is from a td jetta and my car is a gtd golf so all diesel. So i need to connect the w terminal wire to the clocks is that right?? I know where the w terminal is but where do i connect it to the clocks?? Do i need to splice it into the plug that goes to the clocks?? If so which wire is it?? Cheers for the help..shane
Title: GTD Rev counter not working
Post by: zukgod1 on December 02, 2008, 11:50:38 am: Quote from: "Jimmy Diesel Junior"
Hello. The rev counter is from a td jetta and my car is a gtd golf so all diesel. So i need to connect the w terminal wire to the clocks is that right?? I know where the w terminal is but where do i connect it to the clocks?? Do i need to splice it into the plug that goes to the clocks?? If so which wire is it?? Cheers for the help..shane

The wire is already there Shane.

Should be part of the Alt harness from the engine all the way to the cluster.
Title: GTD Rev counter not working
Post by: Jimmy Diesel Junior on December 02, 2008, 11:34:25 pm: Sound, I'll go hunting for it tonight :-) I'll keep posted
Title: GTD Rev counter not working
Post by: Jimmy Diesel Junior on December 27, 2008, 07:25:47 am: Hi all. Just an update. The wire was actually not there at all. i brought a wire from the W-Terminal (green wire) to plug G1 pin 12 in the fuse box and Voila. Thanks for all the help gents..Shane