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Home > Maintenance & Modifications > TD5 rev counter - the cheap option

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DunningBoy

Member Since: 23 Jul 2016
Location: Middle
Posts: 31

I'd love to see the pictures of this to see if it is something I can attempt.

28th Dec 2018 12:50pm

Jontd5

Member Since: 09 Dec 2018
Location: Laois
Posts: 39

Click image to enlarge

Click image to enlarge

That's photos of my spare alternator - basically remove the wires and back cover and cut away the piece of cover circled in red there's and fix a wire to the screw that's right underneath it.

28th Dec 2018 12:56pm

MJN110

Member Since: 18 May 2015
Location: North Yorkshire
Posts: 380

2016 Defender 90 Puma 2.2 Landmark LE Montalcino Red

Click image to enlarge
Mine arrived today from Taiwan 10 days after ordering.
Is it a straight plug and play or is some calibration required? 2016 Defender Landmark 90
2005 Defender CSW TD5 90XS

28th Dec 2018 2:11pm

Adam17

Member Since: 15 May 2018
Location: Within Bedfordshire
Posts: 1193

Thank you for the pics.
How does attaching a wire to the screw give the revs?? Or am I missing a point??
I think I was told before by someone that the revometer has to be wired into the ECU on the TD5 Defender......???? Regards
Adam

Loving The Duchess
The Defender 110 TD5 XS

My Defender story - http://www.defender2.net/forum/topic64005.html

28th Dec 2018 2:22pm

MJN110

Member Since: 18 May 2015
Location: North Yorkshire
Posts: 380

Click image to enlarge

Does this make sense Adam? 2016 Defender Landmark 90
2005 Defender CSW TD5 90XS

28th Dec 2018 2:38pm

Adam17

Member Since: 15 May 2018
Location: Within Bedfordshire
Posts: 1193

Thank you bud, kinda clears things up.
Appreciate your time

Regards
Adam

Loving The Duchess
The Defender 110 TD5 XS

My Defender story - http://www.defender2.net/forum/topic64005.html

28th Dec 2018 2:53pm

MJN110

Member Since: 18 May 2015
Location: North Yorkshire
Posts: 380

Its a pleasure I have just been reading your Defender story it is a great read.
I note you are a detectorist like myself and use a CTX and a 17 coil like i do.
Recently purchased a pro 45 harness well worth buying if you dont have one. 2016 Defender Landmark 90
2005 Defender CSW TD5 90XS

28th Dec 2018 4:15pm

Jontd5

Member Since: 09 Dec 2018
Location: Laois
Posts: 39

Attaching a wire to that screw on the back of the alternator is basically the same thing as using the W terminal on a 200/300tdi alternator - it's connected to one off the stator windings before the rectifier.

As far as calibration goes there's a calibration screw on the rear of the rev counter - the smallest of turns moves needle a lot. Ideally a nanocom on live data is best to calibrate it but both my td5s idle at 780 -800 rpm so setting your idle to that will get it as close as you really need

28th Dec 2018 6:44pm

Adam17

Member Since: 15 May 2018
Location: Within Bedfordshire
Posts: 1193

MJN110 wrote:
Its a pleasure I have just been reading your Defender story it is a great read.
I note you are a detectorist like myself and use a CTX and a 17 coil like i do.
Recently purchased a pro 45 harness well worth buying if you dont have one.

Well thank you chap! Indeed, I have been detecting for a little while now, a great hobby, love the outdoors, and love the CTX.
Ill pm you the rest of this reply... Its turning into a huge spiel lolol Regards
Adam

Loving The Duchess
The Defender 110 TD5 XS

My Defender story - http://www.defender2.net/forum/topic64005.html

29th Dec 2018 10:51am

Adam17

Member Since: 15 May 2018
Location: Within Bedfordshire
Posts: 1193

Jontd5 wrote:
Attaching a wire to that screw on the back of the alternator is basically the same thing as using the W terminal on a 200/300tdi alternator - it's connected to one off the stator windings before the rectifier.

As far as calibration goes there's a calibration screw on the rear of the rev counter - the smallest of turns moves needle a lot. Ideally a nanocom on live data is best to calibrate it but both my td5s idle at 780 -800 rpm so setting your idle to that will get it as close as you really need

Cheers Jontd5. Ill give it a go when I get some spare funds. Regards
Adam

Loving The Duchess
The Defender 110 TD5 XS

My Defender story - http://www.defender2.net/forum/topic64005.html

29th Dec 2018 11:04am

Gilloverland

Member Since: 12 Nov 2017
Location: Yorkshire
Posts: 61

Has anyone found a way to tint the back-light green?

29th Dec 2018 7:10pm

Jontd5

Member Since: 09 Dec 2018
Location: Laois
Posts: 39

Open up the gauge and use a green marker on leds and back on dial

29th Dec 2018 7:19pm

Super7

Member Since: 05 Feb 2014
Location: South Bucks.
Posts: 132

Many thanks to Jontd5 for telling us about this tacho

Fitted mine a few days ago, and it works brilliantly, best £18 i've spent!

I've no idea, how you manged to fit the alternator wire from below though - I quickly got fed up with crud falling into my eyes, and decided to take the alternator out from above

I couldn't get the back off the tacho to colour the LEDs (didn't want to break it), so I've left as is for now

'99 TD5 Defender 90
'52 Series 1 80"
'99 Caterham 7

4th Jan 2019 12:25pm

Jontd5

Member Since: 09 Dec 2018
Location: Laois
Posts: 39

👍👍 good to hear it worked out for you. Yeah the alternator is a pain of a job, was a good hour underneath mine. The black ring around the glass will come off - widen it out from the back, the defender dash will hide any marks in the paint. The needle will pull off and dial will come out, gotta line up needle at zero when putting it back together

Last edited by Jontd5 on 5th Jan 2019 12:27pm. Edited 1 time in total

4th Jan 2019 12:43pm

sako243

Member Since: 08 Jul 2014
Location: Wales
Posts: 1220

1994 Defender 110 300 Tdi CSW Alpine White

miker wrote:
Very interesting! I've always been under the impression that even adding a W terminal wouldn't work due to the 5 cylinder vs 4 cylinder thing. Have you "calibrated" it against a nanocom or similar?

Any details on the mod to add the terminal?

Why would it make any difference as to the number of cylinders?

The W terminal is basically one of the poles from the alternator, that's going to spin at a fixed ratio of the crank (depending on pulley speed and number of poles in the alternator). If you have 4, 5, 8, 12, 16, 24 cylinders it doesn't matter because the crank still turns at the same speed. Ed
82 Hotspur Sandringham 6x6
95 Defender 110 300Tdi

4th Jan 2019 4:20pm

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