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6 pot



Member Since: 01 Apr 2010
Location: England
Posts: 51

United Kingdom 
300 TDI ROW Spec wiring
Hello all

I am helping a friend convert a ex-military 300 TDI Snatch to a standard 110 hard top.
All the body and armour has beem removed and replaced with standard parts so it now looks like a normal 110
We have had two problems the first was side lights not working this was solved by taking the military 7 way convoy switch apart cleaning the copper contacts and putting back togher so all external lights work along with horn wipers heater etc.
The second group of problems are I think all one cause the fuel and water temp gauges do not work nor does the diff lock warning light low brake fluid light glow plug light oil preasure light (head light dim/dip hazzard/indicator fog battery warning lights work)
The wiring diagram in the snatch work shopbook is so wrong I might as will use a 1976 VW Bettle one
the wire colours are not the same as TD5
I found instructions on fitting 300 TDI sender to TD5 gauges but the colours are different
The part number on the loom is YMC004070 but I cannot find a wiring diagram to suit
I would be very grateful for any help or advice
Thanks Rob
Post #834707 1st Jun 2020 9:43pm
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Martin
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Member Since: 02 Apr 2007
Location: Hook Norton
Posts: 6611

United Kingdom 2015 Defender 90 Puma 2.2 XS CSW Montalcino Red
Sounds like you have an ignition feed issue to the instrument pack as most of those you mention are switched on the ground side so require a 12V feed to start with.

Is it using Td5 type instruments or the pre-Td5 type?  1988 90 Td5 NAS soft top
2015 D90 XS SW
Post #834786 2nd Jun 2020 1:37pm
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6 pot



Member Since: 01 Apr 2010
Location: England
Posts: 51

United Kingdom 
It has TD5 gauges and speedo
Post #834876 2nd Jun 2020 9:24pm
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jfh



Member Since: 08 Jan 2014
Location: West Coast
Posts: 359

South Africa 2007 Defender 110 300 Tdi SW Chawton White
In the RAVE manual, go to the wiring diagrams. You will see Td5 and 300Tdi mixed in with the Td5 wiring diagrams there.

Those 300Tdi diagrams are for the last 300Tdi's made. Mine is 2006/7 model and I use it a lot.
Post #835019 3rd Jun 2020 4:18pm
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Martin
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Member Since: 02 Apr 2007
Location: Hook Norton
Posts: 6611

United Kingdom 2015 Defender 90 Puma 2.2 XS CSW Montalcino Red
At the grey dash plug, check for ignition 12V supply to pin 1 (the pin numbers aren't marked, so look for a ). Should be WHITE or WHITE/GREEN wire, but might be another colour on a military loom.

To help you find the correct pin number, looking into the non-wire side of the plug on the bit coming from the bulkhead (not on the instrument pack), with the clip on the top, pin 1 is top left.


Click image to enlarge


Find pin 1 and write it on the plug with a marker pen Thumbs Up Wink

Do the same for the smaller black warning panel connectors, pin 1 of the 16 pin and pin 16 of the 20 pin are 12V ignition feeds.

Again, holding these facing you with the clip on the top - pin 1 is top left.

On the "civvy" late ROW 300 Tdi these feeds have a common fuse (fuse 15) but who knows on the military one Wink  1988 90 Td5 NAS soft top
2015 D90 XS SW
Post #835121 4th Jun 2020 9:24am
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Martin
Site Admin


Member Since: 02 Apr 2007
Location: Hook Norton
Posts: 6611

United Kingdom 2015 Defender 90 Puma 2.2 XS CSW Montalcino Red
On military spec wiring the ignition feed is likely to be plain GREEN  1988 90 Td5 NAS soft top
2015 D90 XS SW
Post #835123 4th Jun 2020 9:35am
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BogMonster



Member Since: 05 Feb 2008
Location: Stanley
Posts: 400

Falkland Islands 2015 Defender 110 Puma 2.2 USW Corris Grey
This may or may not help you but way back when in the dealership, when we got the first late 300Tdi engines, there were problems with the harness inside the dash being wrong and among other things I know it screwed up the temp gauge. There are 2 different types of harness, can't recall the part numbers now but I know a Td5 one didn't work with a 300Tdi installation. ---
2006 Defender 110 SW 300Tdi • 2011 Ford Ranger XLT crewcab • 2015 Defender 110 Station Wagon Utility TDCi
Post #835443 6th Jun 2020 10:52am
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6 pot



Member Since: 01 Apr 2010
Location: England
Posts: 51

United Kingdom 
All sorted now thanks
Post #835803 7th Jun 2020 8:02pm
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Martin
Site Admin


Member Since: 02 Apr 2007
Location: Hook Norton
Posts: 6611

United Kingdom 2015 Defender 90 Puma 2.2 XS CSW Montalcino Red
What was it?  1988 90 Td5 NAS soft top
2015 D90 XS SW
Post #836341 10th Jun 2020 2:47pm
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6 pot



Member Since: 01 Apr 2010
Location: England
Posts: 51

United Kingdom 
As the Snatch is a 24 volt vehicle I thought the dash was all 24 volt (some of it worked) I took a standard TD5 defender dash apart to have a look and found the gauges are the same as the Snatch ones (12 volt) it took a while to click but i found a empty plug that should have a voltage dropper pluged in once pluged in every thing worked as it shoud
This is very good but I cannot work out why half the dash would be 24 volt and half 12 volt.
Post #836667 11th Jun 2020 8:59pm
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