Is this the "W" terminal on a 300TDi Altermator??

Def110TDi · Dec 26, 2011

Hi all,

was looking at fitting one of these rev counters to my Defender ( BLACK FACE REV COUNTER TACHO RPM GAUGE - DIESEL TDI TD | eBay )

from looking at forums and web pages i see that it is the "W" terminal on the alternator that the signal wire is fitted to but i was just looking for someone to confirm which one is which before i start ripping wires out...

Here is a picture of my alternator and the wire i think leads to the "W" terminal

Cheers Robert

P.S. Anyone know what this terminal does?

elsie · Dec 26, 2011

"w" is the one , did work at an auto electrical place a few years ago .

The Mad Hat Man · Dec 26, 2011

no thats power out
what make n model is yo alternator?

Def110TDi · Dec 26, 2011

The Mad Hat Man said:
no thats power out
what make n model is yo alternator?

as far as im aware its standard land rover, 1995 300tdi defender

The Mad Hat Man · Dec 26, 2011

no such thing as standard landrover...
if it has a extrenal cooling fan on the front it'll be a Lucas A127 65amp or if the fan is internal it'll most likely be a Marrelli 100amp,

w is tacho, big stud D+ is output and goes to battery, small stud goes to warning/charge light.

this mite help? A127

Def110TDi · Dec 26, 2011

The Mad Hat Man said:
no such thing as standard landrover

w is tacho, big stud D+ is output and goes to battery, small stud goes to warning/charge light

Cheers, think i know what i need to do now, thanks mate, you wouldnt by any chance know what would happen if i removed the tacho wire and ran the engine?

jamesmartin · Dec 26, 2011

b+ goes to battery d+ warning light w as said rev counter

Def110TDi · Dec 26, 2011

Had a quick search on fleabay and it looks like the same alternator as the one on my 110
LAND ROVER DISCOVERY 2.5 300TDi 94-98 ALTERNATOR AL152 | eBay

The Mad Hat Man · Dec 26, 2011

Def110TDi said:
Cheers, think i know what i need to do now, thanks mate, you wouldnt by any chance know what would happen if i removed the tacho wire and ran the engine?

yu wouldnt have a working tacho :doh:

Def110TDi · Dec 26, 2011

The Mad Hat Man said:
yu wouldnt have a working tacho :doh:

i know how stupid this sounds but what is a "tacho"....apart from mexican food?

The Mad Hat Man · Dec 26, 2011

let me :googleit: for you?

Def110TDi · Dec 26, 2011

The Mad Hat Man said:
let me :googleit: for you?

ive googled Lucas A127 W terminal but cant find an explanation

The Mad Hat Man · Dec 26, 2011

did yu press the :googleit: button?

Def110TDi · Dec 26, 2011

The Mad Hat Man said:
did yu press the :googleit: button?

lol, ill need to try that

mark g · Dec 26, 2011

From memory when i did mine I think "W" is stamped on the terminal, it small and you just gotta look harder.

Def110TDi · Dec 26, 2011

mark g said:
From memory when i did mine I think "W" is stamped on the terminal, it small and you just gotta look harder.

At the point "13-94" on the picture to the right, can i just attach a wire to that stud to take a signal from it?

Alternator stripdown and repair

The Mad Hat Man · Dec 26, 2011

Def110TDi said:
At the point "13-94" on the picture to the right, can i just attach a wire to that stud to take a signal from it?

Alternator stripdown and repair

does it have "Used for the Tachometer"? written on the pic?

Def110TDi · Dec 26, 2011

MBrown · Jan 24, 2012

does this work the same say for the 2.5 petrol 4 cylinder?

Def110TDi · Jan 24, 2012

If yours is petrol then check this out.....[ame=http://www.youtube.com/watch?v=C7uCSclfQEU]Fitting a Rev Counter to a Defender V8 - YouTube[/ame]

Is this the "W" terminal on a 300TDi Altermator??

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