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Defender 3.9 V8 Wiring Harness


Cat_J

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I have decided to start a new thread as the last one was off the back of some wrong information. I'm building a full loom from scratch for a friend so I'll use this thread if I get stuck anywhere. I'll also post up some progress pictures in case its of any help to anyone in the future.

The defender is a custom build from the ground up, starting on a Richard's Chassis and parts being bought as needed. Theres been a few changes along the way, was originally a 300Tdi I think, then a TD5 and has now settled on a V8 auto (after moving the chassis mounts again.) I'll post some pictures with the owners permission.

It turned out to be half the cost to buy a brand new tdci bulkhead and have it galved rather than an original one, they will be using a tdci seatbox I believe but to be honest they know much more about what body work fits together than me. The tank has been moved to the rear so the wiring can go under the driver.

I have a tdci fusebox which I'm going to build out of. ECU will also be located under the driver.

The first thing I'm going to do is strip the fusebox, I want to use a higher quality wire from end to end. To this end I need to source the terminals for the blade fuses. I think they are the same as these Female Terminal. If someone could confirm this that would be great.
This is the fuse box and terminal:
fusebox.jpgbladeterminal.jpg

If this is right then it looks like I'm going to need to make a tool to extract them. Its quite hard to see from the front or rear exactly how they are located.

After speaking to ATP who recondition the ECUs of these vehicles this appears to be the correct ECU connector diagram for this model. ECU (Thanks for the link ralph) This ECU has been confirmed by various sources to also work with the 3.9 V8.

lucas_efi_1982_1984.jpg

I also need to find the terminal for the square fuses and the relays. As these are simple enough to extract though I'll see if work can help me there.

Square Fuse:

squareblade.jpg

Relay Socket:

relaysocket.jpg

I have higher resolution pictures of everything but didn't want to make a mess in the forum. I'm just waiting on all the relays/coil/ballast/ignition switch to get started on the circuity. Current goal is to get her running and moving so it can go away to have body work done and be moved around the workshop. All other electrics will be done on its return.

Current thinking is to use a tdci dash but gut the gauges and replace the internals with td5 ones.

Its gonna be fun on a bun!

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Leoni Wiring Systems are the OE supplier to Land Rover (and several other vehicle manufacturers).

They have a facility here in the UK (the old Lucas-RISTS site) -

LEONI Wiring Systems UK Ltd.

Lower Milehouse Lane
Newcastle-under-Lyme
Staffordshire,

ST5 9BT
UK

Phone +44 (0)1782-604200
Fax +44 (0)1782-604240

The terminals you linked to, and the ones that I linked to at Polevolt, are by MTA - http://www.mta.it/en/home

Some of them may be compatible with the Leoni fuse box :unsure:

The fuse box part/assembly numbers (along with several other bits on current Land Rovers) are in the same format as used by Ford.

.

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The LR part number is ERR722.

However as long as you have a set already, they are cheap to have them professionally reconditioned with new o-rings and caps etc. They then check them for spray pattern and provide you with a flow chart.

That's what I did with mine as they were a set bought from eBay and I didn't have a setup for cleaning/checking them.

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Sorry mate I had a look but I seem to have lost the paperwork. Probably lost during a workshop move :(

Only thing I do know was that it was by a company advertising on eBay that had a very good reputation. I will have a look on eBay and if a company rings a bell I will post back..

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I believe it was this company.

http://www.injectorcleaning.co.uk/index.htm

The price has increased a little since I had mine done a few years back but they did provide a very good service with a quick turnaround.

Edit: I was happy that I had it done. If I remember correctly 3 or 4 of my 8 were really bad.

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  • 1 month later...

So after a delay and some final changes this is no longer going with 4cu, it'll be run on 14cux as that is what originally came with the engine, and from the looks of it is a nicer system.

The 14cux posed a problem with gettign a ECU connector, as nobody seems to have them. Fortunately I now have an original engine harness (with a few random modifications as per) and the connector is easy to depopulate. I'm about 75% of the way through writing up the circuitry for this now, so should have that done tomorrow and have the connector off. Surprisingly almost all of the wire colours match the diagram too.

v8engineharness.jpg

hotwire3.jpg

So now I'm hoping what was a rather stalled start will now pick up quickly. One thing that would be useful, I'm struggling to find is a pinout for the dashboard connector. This would be really handy as the dash will be updated anyway. I believe this is the connector:

dashconn.jpg

I have also made an extract tool for the fusebox terminals (lucky GF leaves many hair clips all over the floor ^_^) and managed to source the blade fuse terminals. Also have good information that a local auto electrical shop have the others so should be fine there. Looking forward to it all now, hopefully something will come together over the weekend.

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Damn it I knew someone was going to say that.

He wants a stock setup, and the chip is replaceable to improve the top end performance. Really doesn't want anything to tweak and play about with, just get it going right and leave it.

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  • 3 weeks later...

Well after a busy period at work I've finally got the circuitry done, had a couple of wires that I couldn't identify so ended up taking the old harness back to the engine and laying it back on to find where they go. These were wires going to the dash connector which I have no info for. I found 2 of them are sensors, one oil and another a 2nd water sensor. It looks like there is one coolant temp sensor going to the ECU, this is located by the fuel temp sensor, and another at the front near the pump going to the dash.

I also found out what the extra lead I had was for. It connects the disty to the ignition amp. I know for all you petrol heads out there this will be obvious but if I'm honest I've been a diesel person all my life and this is the first petrol engine I've worked on, so its a learning curve for me. However the amp itself is nowhere to be seen, there is a 2 way Econoseal plug on the disty, the other end of the lead has a 3 way Econoseal plug which must connect to the amp. The lead is a screened paired where the 2 wires go into the 2 way on one end, and the same wires go into pins 1 & 3 on the 3 way at the other end, pin 2 is attached to the screen (drain.)

Does anybody have a link to the amp, he's going to need it and if there isn't one there now I'm assuming it was lost with the old coil.

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His engine is obviously a serpentine version. .... The amplifier is on a bracket next to the coil..... The earlier version had it on the dizzy but they're prone to failure. .... if you search eBay for rover v8 ignition amp there's a kit that would suit you. ... its for modifying an earlier version but the amp and brackets are the same. ... However ... Some of the kits were made with the two wires the wrong way round. ... so if it doesn't run straight away that might be the reason. ....

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OK thanks I've forwarded the ebay link to him so he can buy it if the original can;t be found. What kind of modifications if any would be required for the RPI kit, I'm just interested now. Does it make a noticeable difference?

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OK thank I'm going to contact them and see whats what. Can anyone tell me where to locate the purge valve, its the one thing I couldn't find. I think I understand what it does, feeds excess gas back into the engine, but I don't know where it is.

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Also can somebody tell me what this is, having trouble find it on microcat.

sensunknown.jpg

I know the JT connector next to it is the ECUs coolant temp sens, so that I'm not sure about, the wire seems to go to the dash and there is already another temp sens by the pump that goes there.

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