ca18det wiring harness

[northerner]

Originally Posted by 30psi

Yeah I remove from that loom the wires I didn't need. I can't remember what the blue relay was for, but I chucked it out.

You'll end up with a number of black and red wires that feed the relays and the loom for you to put permanent and switched power to.

There's also one very thin black wire that needs to be earthed.

I kind of knew you were going to say that so as I had the afternoon off. I cut out all the wires for the 3 relays leaving plenty of meat to play with. I did the same with the brown and gray plugs. As I already had a butchered loom I managed to get another green relay (fuel pump). I found the relay box comes apart so I played around and managed to make a block of 4 green relays with three bladed fuses on the end. This makes it more neat to look OE

[northerner]

I also followed the ECU pin diagram to find out for sure what each wire does on the brown and gray plugs. This is what I found

8 Pin grey plug :
Red/Silver band ECU 12v perm live PIN 58
Blue/Green silver band A/C relay *NOT USED*
Black/White silver band ECU eccs 12v switched PIN 109
Blue/Red Plug loom 12v switched (no pin)
Black/Red Ign power 12v switched PIN 45
White (shielded) Knock sensor (I will wire this in further towards the bulkhead)

8 Pin brown plug
Green/Yellow silver band A/C relay *NOT USED*
Black/Red silver band Eccs power 12v switched PIN 16
Green/Orange silver band Inhibitor relay *NOT USED*
Black/Purple Fuel pump relay PIN 18
(NOT SURE WHICH PIN ON THE FUEL PUMP RELAY)
Black/Yellow ***** Dont know what this is ???!!****
Brown/silver band O2 heater (my ECU plug does not have an 02 wire)

Now I think I have all these correct (if not then say!) but I need to know if my dodgy relay wiring is OK ? Can I run one Permanent Live/One switched 12v/One ground jumped through all the relays ???

[30psi]

I recall that some of the relays shared the shame power source even on the standard loom. You only need 3 relays though not 4.

I'd have to look back at my loom to remind myself what I did, but basically the 3 green relays plug in to the engine loom via the brown and grey plugs. You'll find the length of the wiring quite long, you could shorten these if you wanted.

I then found there were loose wires going to the relays for power, earth and switched ignition.

[northerner]

Once I'm ready for the transplant and the DET is in, I will shorten the wires accordingly. The 4th relay I put in there is for the Fuel pump or are you saying I could double it up on another ?

[30psi]

The 3 relays there are for the ECU, power transistor (the silver square box) and the fuel pump.

No need for another relay

[northerner]

Originally Posted by 30psi

The 3 relays there are for the ECU, power transistor (the silver square box) and the fuel pump.

No need for another relay

OK I will maybe use the space to tidy up my relays for radiator fans.

Any idea which pin on the relay I should use for the Fuel pump wire (Black/purple on the Brown plug). I take it this will be the fuel pump trigger wire from that comes from the ECU ???????

[30psi]

I'd have to check on a wiring diagram whether the ecu earths out the relay or puts power to it, but I think all you need to do is connecting the output from the relay to the fuel pump.