mega squirt wiring on a mk1, fuel pump feed? UPDATE 21-7 NEARLY THERE

Im in the process of fitting a megasquirt ecu into the mk1 to control the new engine, when it was taken from the last car the wiring on the fuse box was like this:



now mine doesnt have the relay thats rinnged - I think its the fuel pump relay - do I need it? (I have wires going to where it is...but no relay)

also where the red and yellow wire comes from the fuse box plug, I dont have anything.... now the wire on the MS loom says "fuel pump" so do I just fit a connector and inset it into the multi plug? (the other car also has the yellow wire thats bunched up... I dont have that either on mine..im not sure if this is tee-ed in to the switched live off the fues box or not..

this is how my fues box looks at the mo.



Ive got the 2 main wires connected.... but the 3rd im stumped...

any help guys?

 

im keeping the factory rev counter, and I dont think my fuel pump has a rev limiter built in as I used to run my 8v on a after market limiter with a 7k limit...

so should i just add a connector to the fuel pump wire thats bare at the mo and insert it then? (I dont like electrics... can you tell )

 

so what about the blue fuel pump wire? or just egnore that?

 

yep its in the megasquirt loom... Ill try it just tied up then

 

If it is a MS1 on V3 PCB
You need either an external relay to control the F/P or connect to the factory positions on the Fusebox.
N= Injector supply
R 1 = Digifant relay supply
R 2 = Digifant relay output to ECU.
D13= F/P relay trigger from MS Pin 37

MS Pin 37 triggers the earth on the relay coil to switch on the F/P and also injector supply. If not using factory relay location, then supply relay with power from Ter30 or Batt +ve use 20A fuse if not using VAG fuse box.
The relay coil should supplied with switched 12v (0.5 blk/yel) or Ter15 ignition supply ( 0.5solid black)
Relay coil earth should be 0.5mm red/yel to D13 on fusebox
F/P supply 2mm red/yel.
Injector supply 1.5mm red or red/black.

You can use pre 90 digifant relay to supply power to the MS else normal 4 oin job can also do the trick.

If you get stuck send me a pm and I will dig out my notes.

 

Right I plan to get it running tomorrow, so.... the plan is check what relay I have in position 2 and if its a 67, 167 or 80 then I just jump off pin D13 as on the old car and job done?

what are my options if I dont have that relay? or is it a case of go and hand money over to GSF and get one?

Cheers

Karl

 

Right, I have been to the scrappy for a few bits and bobs and have got a few 167 and 67 relays from mk3 golfs, so the plan is put that in position 2 and then attach the blue wire to pin D13, and job done?

 

right, so so long as my wiring mirrors the one it came from IE the blue in D13, the other 2 in the same locations we should be good to rock..

 

Yes, "N" is where I power injectors from on MK2 ver 1 fuseboxes for aftermmarket ECUs. As an alternative you can power them from the fuel pump voltage supply.
This is where it was originally powered from for the ECU that is now owned by M7R.

 

Karl I believe all the relays are the same. Earthing D13 will liven up the F/P relay. This is where MS pin 37 would connect to.
I spoke to G60RGE and this is where he cut the wire from. This blue (labelled "F/P") wire should trace back to MS pin 37.

 

This is not good industry practice unfortunately. I would perfer the MS ECU to carry out the above function as a standalone. This wiring set up as decribed by myself was running in the doner car for 3 years without fault or failure. It is recommend to stick with this format.