Author Topic: GTD Rev counter not working (Read 5605 times)

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.....

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

Thanks alot, Joel

Demons UK · « **Reply #1 on:** August 13, 2007, 10:18:17 am »

Duno if these help mate but?

Vincent Waldon · « **Reply #2 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.

numbnuts · « **Reply #3 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 :?

Vincent Waldon · « **Reply #4 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

numbnuts · « **Reply #5 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:

Vincent Waldon · « **Reply #6 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.

Vincent Waldon · « **Reply #7 on:** August 13, 2007, 06:55:46 pm »

Here's the alternator schematic:

numbnuts · « **Reply #8 on:** August 14, 2007, 09:12:54 am »

Thanks alot, i am about to solder it when it stops raining :roll:

Vincent Waldon · « **Reply #9 on:** August 14, 2007, 09:20:18 am »

Which, in England, will be sometime next summer ??!!!! :lol:

Vince

numbnuts · « **Reply #10 on:** August 14, 2007, 02:11:25 pm »

you are not wrong :roll:

zooky · « **Reply #11 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?

Vincent Waldon · « **Reply #12 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

Jimmy Diesel Junior · « **Reply #13 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?

?

Jimmy Diesel Junior · « **Reply #14 on:** November 30, 2008, 10:17:26 am »

anyone know about this??? cheers