Electrics question ce1 88 mk2 golf gti

[rubjonny]

your megasquirt ecu diagram should show you which wires go to which relay pin, and on the back of the relay it should have the same numbers. pop relay into holder then make a note of which pin fits where, and push your wires into the back accordingly

[emery1990]

OK cheers, I thought my relay would have like 30, 87 etc on it, then I wouldnt be stuck, but it has 1 2 3 4 on it. That relay in that link is set up exactly the same as mine.

On the ms diagram it has got battery going to 30 , ign 80 earth trigger 85 then 87 for the injectors and ms ecu, I can just join them two up together cant I? So have thicker wire coming out of the relay then splits into two ways with smaller wire. Im going to get a new wire from the battery to feed the relay, so what size fuse and thickness wire should I use for that ? Oh john, on that pole vaults, which spade bits do I need as there is quite a few but none say like gripped or anything? www.polevolt.co.uk 

Thanks, If that is how I wire up the relay then that sounds easy 

Also would this 3 way plug fit onto my tps plug? Or do I need a vag plug.

[rubjonny]

ah ok. 9 times out of 10 the relay pinout will be the same anyway, so the guide showing 30, 87 etc should have em in the same spot on your relay.

yeah can run ecu + injectors off the output pin on ecu relay, this is how CE1 digifant does it. 90spec the injectors are switched to pump relay, but it makes no odds which way you do it.

same rating wire as you use for rest of ms loom should be ok, i have a load of thinwall 25amp wire which i use for most things involving custom relays, just make sure you put 20a fuse on there somewhere

you want 'latched' terminals from this page, measure the legs of your relay but pretty sure they'll be 4.8mm on there. just a case of pickign the right size for the wires you're using:
http://www.polevolt.co.uk/acatalog/4.8mm_Terminals.html

need a good crimper too, something like this:
http://www.polevolt.co.uk/acatalog/info_TT73.html

for the tps it could be the 3 way plug either here:
http://www.polevolt.co.uk/acatalog/Packard_Timer_Connectors.html

or here:
http://www.polevolt.co.uk/acatalog/Junior_Power_Timer_Connectors.html

burt look at the plug on your tps very closely. in particular look at the locking tabs, you'll note power-timer has 3 lock tabs, packard has 2.

[emery1990]

You are an actual star 

I have no more questions funnily enough 

Thanks again.

Found that crimper for a tenner on the bay too 

Just looked, my relay is 6mm.

[emery1990]

Accidently bought about 120 of those spade bits  All are too big 

[emery1990]

All bits are here, got my fuse holder too.

What size wire can the constant live from my battery to the ecu relay be, does it have to be massive like the other one, or as its just doing injectors and ecu can it be smaller. Or is there somewhere I can spice into. If so can I just cut that wire and solder mine in so its like a junction or do I need a junction fitting.?

Also where should I put the fuse holder, the spade bits that come with are massive, so thinking I may have bought the wrong kind. Also the ecu and injectors, can I crimp into the same spade bit.

[rubjonny]

live feed you can take from the back of the fusebox, there are a group of spare ones. you'll see them as they are next to a pair of massive red spade wires going to the fusebox.  it shouldnt need to be a huge gauge wire, the same size as all the other wires to the ms ecu should be enough.  fuse holder just put it somewhere near the fusebox so you can get to it. you can get vw fuse holders which will clip above the fusebox too.  you can crimp both the injectors and ecu wire to the same spade, just as long as the spade you have is big enough to take them both!  twist the wires together and make sure you get a good crimp on it. some like to add a bit of solder to the crimp after to ensure a good contact

[emery1990]

Cheers mate, them spade bits i got where all too big even the other ones i ordered1.0mm- 0.5mm, just going to fold the wire over make it bigger

[emery1990]

Ive lost the piece of paper that tells me what black wire to use. With the 5 short ground wires, do I take the thickest ground wire and use that to take them all to ground, also I know I have to use one wire to take the sensors to ecu ground pin. But what about the other ground wires do they go to ground too ? Will be done once Ive done this!

[emery1990]

"The main grounds from pins #8, 9, 10, 11,& 18 go to one spot on the engine block. Do not ground them at physically separated locations, and do not use a single fat wire for this. Instead run separate wires from the pins all the way to the ground spot."

I thought you use the crimp you get with the ecu to crimp these wires together?