Cosworth BOA - Engine Harness

Cosworth BOA - Engine Harness / Loom

In the Granada the ECU is mounted behind the glovebox and so the engine wiring loom is laid out to reflect this. Therefore, when transferring everything into the new vehicle, it would be beneficial to mount the ECU in a similar position. That way the loom can be laid out in a similar fashion.

The majority of the connections will be pretty obvious due to the way that the loom naturally lies and the fact that the plugs will not mate with the wrong sockets.
There will be a number of redundant plugs but hidden amongst them are some crucial connections. These are:

1) Ignition switch signal to turn it all on. This is the supply to the 'Power Splice'
2) Rev counter output
3) Fuel pump relay feed and switched earth

The signal for the engine temperature gauge is not actually included in the engine harness, that was part of the vehicle main harness so use your cars existing wiring for that.

Ignition 'On' Signal & Rev Counter Signal

The first two hidden items are in the same two pin multiplug. This is a white plug with one black and one green wire. It naturally runs across the bulkhead, please see the photos below.
I'm afraid I cannot be more specific but I did not decipher this part of the loom until after I had installed it into my Cortina.

White two pin plug with black and green wires.

Black Wire - Ignition 'On' Live Connection
Green Wire - Rev Counter Signal

Fuel Pump Relay

The two wires (live and switched earth) that operate the fuel pump relay are hidden in this 6 pin oval plug that would have originally been located behind the dashboard near to the ECU. The two pins that are used are the middle pin of each row as seen in the photo.

Remaining /Redundant Connections

Not an exhaustive list but here are some of the unrequired lose ends.

EGR System connections. These naturally lie behind the RH headlight area and are surplus to requirements.

Engine Diagnostics Ports.
This is before the introduction of the standardised OBCD port. Located near the LH side of the bulkhead (engine side).

Would have been behind the dashboard originally so will want to naturally lie in that position.

I can't remember, but it isn't critical. Sorry.

If I find any more of my notes I will update this section but everything required to get the engine running is in here.

The contents of this website are purely a reflection of my own experiences and knowledge gained whilst working on my various projects. Anything you do based on what you have read here is done so entirely at your own risk.
Personally I wouldn't trust someone like me with a lawn mower! You have been warned! Flapper-bat!