VDO Hall Sender.

[Kelvin12]

One for the electrical genius.... Can someone give me the wiring diagram for a VDO 3 wire, (THREE WIRE) Hall effect TACHO Sender. Used on Detroit diesels for tacho and speedos back in the good old days. Have wiring diagrams but only relate to the 2 wire system. Seems they are long out of favour and really hard to find the diagrams these days. The USA seem to use other senders that aren't the same.

Dirk

[T1 Terry]

https://www.youtube.com/watch?annotatio ... 1XzwZE6n8M I'm guessing the red positive wire is powered from the ignition switch.

T1 Terry

[mikeg]

Check out this mob in Newcastle they should be able to help.
http://www.gauge-shop.com.au/productlines/vdo

[jon_d]

Dirk.
what are the model numbers? there will be a ??10-12 digit part number for the sensor and the meter.

My bet is 2 wires to the tacho and one to battery. Need to find out which wires!

JD.

[supersparky]

Dirk, Mr Google will be your best bet. Hall Effect sensor can work in a few different ways, I am a bit foggy about them now. Some of the yank stuff had a 5v reference and others were 10v or even 24v so be a little bit cautious. I copied this from the google search page. It suits my memory best on Hall Effect. Just imagine tacho instead of speedo.

speedometer_wiring.jpg

Edit. Try this link http://sydney.edu.au/engineering/aerome ... wiring.PDF

I found that by googling VDO 3 wire Hall Effect.
Good luck

[Busman]

I found this when I fitted my cruise control. A lot of this era VDO stuff had 7 volts going to the sender which was returned back to the, in my case tachograph (combined speedo and tacho.
Spent weeks trying to get the cruise to work, a chance remark at Sgesco in Brissie alerted me to the 7v so I asked about putting a higher voltage on it for the cruise, was told put 12 or 24, it does not matter. Put 12 v on it and the cruise started working, the 7 v was not enough of a signal for the cruise to see.
However the tacho part was simply 2 wires for power and another one that read the alternator output.

[Kelvin12]

The link below from Mikeg pretty well shows the tacho, the 3,000RPM larger one in the photo. listed as Cockpit International. I can't remember exactly but believe its a programmable one and the is a window in it similar to a speedo odometer. Of course there are no part numbers or identification on the thing other than its a VDO. And of course I have saved the paper work but no idea where it is now. ....
http://www.gauge-shop.com.au/productlines/vdo

On the back are push on terminals numbered 1-8. But not further detailed.

The sender is a VDO part number, 340807/1/3. The terminals are marked, GS, C_, ZO I am guessing the "s" is sender, ??? and the "C" ground, ??? and the ZO, I have no idea. The terminals are all nut connections.

Terry 1. I did see that video and took a chance with the sender guessing the terminals !!!!, and found both the outer terminals give a reading on the multimeter. I used the centre terminal as the ground.

Thanks for the input crew, hopefully someone might know how its hooked up.

I'll give the Newcastle link a try and see if I do any good there.

Dirk

[Busman]

My second tacho is a Cockpit VDO one, if you can wait until tomorrow I will have a look and let you know.

This is where I got my info from. As they are programmable I would simply use an alternator wire, you can adjust the revs to suit

http://sydney.edu.au/engineering/aerome ... wiring.PDF

William

[jon_d]

The tachos will be the same input connectors. VDO are German so everything will be standard.

The hall effect uses three wires; 2 to get the signal back to the tacho and one to "bias" the signal voltage/pulses into the voltage range.

So, one wire needs to go to battery. And two to the pulse terminals on the tacho. If they are red, white black, I'd be saying white is the pulse. Black is the ground/signal return. Red is battery

[jon_d]

Ok, found it!


The 340807/1/3 is a pulse generator and not a HallEffect.

Search in google for this "340807 001 003"

http://www.howardinstruments.com.au/upl ... sories.pdf



It's B2