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trailboss



Member Since: 22 Nov 2023
Location: Queensland
Posts: 4
Australia 1996 Defender 130 300 Tdi HCPU Alaska White
Alternator terminal identification
Please ignore the state of the terminals (I'll clean them up today), can someone please tell me which one is the "W" terminal for attaching a tacho? Obviously not the top one but I'm unsure which
one of the "lesser" terminals it is and I can't see any markings.


Click image to enlarge
Post #1016795 30th Nov 2023 4:54am
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geobloke



Member Since: 06 Nov 2012
Location: Nottinghamshire
Posts: 4410
United Kingdom 
As that picture is the W terminal should be the lowermost terminal with the post, nut and spade terminal.

If you look at Gwyn bay post below. Third photo down is the rear of the alternator. Hover/Zoom over the photo and you can rear the terminal designations.

https://www.ebay.co.uk/itm/175055601161?ch...3kEALw_wcB
Post #1016805 30th Nov 2023 8:38am
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trailboss



Member Since: 22 Nov 2023
Location: Queensland
Posts: 4
Australia 1996 Defender 130 300 Tdi HCPU Alaska White
Thanks, I thought it would be the bottom one, just wanted to make 100% sure instead of blowing up a brand new tacho.
Post #1016808 30th Nov 2023 8:50am
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geobloke



Member Since: 06 Nov 2012
Location: Nottinghamshire
Posts: 4410
United Kingdom 
No problem. Your taco should have a potentiometer screw on the side maybe dip switches on the rear to adjust the idle speed and needle sweep. Idle should be about 750rpm on a tdi and max out around 4000rpm. I remember it can take a bit to get this right, I drove around for a week or so tweaking the gauge until I was happy with it Rolling Eyes
Post #1016811 30th Nov 2023 8:54am
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Martin
Site Admin


Member Since: 02 Apr 2007
Location: Hook Norton
Posts: 6613
United Kingdom 2015 Defender 90 Puma 2.2 XS CSW Montalcino Red
It does appear to be very faintly marked with a W below that post/tab:


Click image to enlarge  1988 90 Td5 NAS soft top
2015 D90 XS SW
Post #1016820 30th Nov 2023 9:52am
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trailboss



Member Since: 22 Nov 2023
Location: Queensland
Posts: 4
Australia 1996 Defender 130 300 Tdi HCPU Alaska White
geobloke wrote:
No problem. Your taco should have a potentiometer screw on the side maybe dip switches on the rear to adjust the idle speed and needle sweep. Idle should be about 750rpm on a tdi and max out around 4000rpm. I remember it can take a bit to get this right, I drove around for a week or so tweaking the gauge until I was happy with it Rolling Eyes


It does, it has a trim pot on the back and I have an optical RPM meter to calibrate it with.
I do like the idea of a second alternator, I need to see if I can get a bracket kit here in OZ without having to pay 50 pounds for shipping. You guys are fortunate to have so many parts available in the UK at very reasonable prices.
Post #1016931 1st Dec 2023 12:13am
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trailboss



Member Since: 22 Nov 2023
Location: Queensland
Posts: 4
Australia 1996 Defender 130 300 Tdi HCPU Alaska White
@Martin

You know, I think you may be correct. I have some work to do on the girl, the previous owner didn't believe in cleaning much, LOL. Got some chassis rust to deal with as well but price-wise wise I stole it and it only has 24,000km on the engine so I can deal with that. Having a vehicle hoist in my home workshop helps.
Post #1016934 1st Dec 2023 12:18am
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