Which wire is one two and which is three?
they are not labelled 2x are one colour and one another black and white,
Stu did say in a post a while back

wire 1; chassis Gnd
wire 2; Fuel pump relay live
wire 3; ECU pin2

So is ECU the single colour and 1 and 2 are the 2x same colour wires I guess, it doesnt matter which right or??

Help a numpty

 

I think the 2 wires with the same color are for the internal heating element (possible grey?). The black one to gnd and the white one to pin 2.