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PostPosted: Sat Jan 09, 2021 12:22 am 
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Joined: Thu Mar 17, 2011 5:57 pm
Posts: 187
Hi all! First of all it’s good to be back after god knows how many years being unable to log in, so thank you to everyone involved in fixing the site up!

I’m going straight in with something i know a lot of you could help me with....

so I am trying to wrap my head around how I will wire up my omex 200....

It needs a few ignition lives, one for the coil, one for the ECU itself, and two relay triggers for the fan and fuel pump....

For those that have fitted an after market ECU, how have you done this?

I could just solder everything on to the ignition barrel, or add a junction block to the coil wire (I think it's still there), assuming these are the only ignition lives we have? However, I'm not too sure about adding on to 40 year old wiring, although light, so I'm thinking of using a wire from the ignition coil, or the old coil feed just to trigger a relay that will make a new fuse box live, to supply all my feeds etc....

I have drawn up a few options that all work in theory, has anyone done anything similar or can anyone recommend an option to go with?

Option 1 - The ECU, coil pack, and relay triggers for the fan and fuel pump relays all take power from a fuse box made live by an ignition switched relay. The fan and fuel pump take power straight from the battery with their own inline fuses...

Image

Option 2 - Similar to diagram 1 except the fuel pump now takes its feed from the fuse box rather than the battery.

Image

Option 3 - Everything is now connected to the fuse box, feeds for the ECU, coil, fan and fuel pump, and the triggers for the fan and fuel pump relays.

Image

Many thanks!!


Last edited by pierce_xr2 on Sun Jan 10, 2021 5:20 pm, edited 2 times in total.

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PostPosted: Sat Jan 09, 2021 2:46 am 
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Joined: Fri May 23, 2003 11:04 pm
Posts: 22276
Location: County Durham.
My xr2 runs a Zetec running Megajolt way I wired mine was to wire in a relay.
Power was switched to the ECU from the battery via the relay and a fuse.
The relay was initiated by the carburetor solenoid wire.
This remains cranking live unlike most other circuits that switch off as the ignition is in position 3 and the starter cranks.

Hope that helps.

Jason.


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PostPosted: Sat Jan 09, 2021 1:05 pm 
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Joined: Thu Mar 17, 2011 5:57 pm
Posts: 187
Jason wrote:
My xr2 runs a Zetec running Megajolt way I wired mine was to wire in a relay.
Power was switched to the ECU from the battery via the relay and a fuse.
The relay was initiated by the carburetor solenoid wire.
This remains cranking live unlike most other circuits that switch off as the ignition is in position 3 and the starter cranks.

Hope that helps.

Jason.


Thanks Jason, I'll have to see if I can locate the carb solenoid wire in my loom, if present, as that sounds like a good option to take a relay trigger from!


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PostPosted: Sun Jan 10, 2021 5:29 am 
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Joined: Fri May 23, 2003 11:04 pm
Posts: 22276
Location: County Durham.
No problem.

Jason.


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PostPosted: Mon Jan 11, 2021 9:52 am 
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Joined: Sat Mar 14, 2009 1:39 pm
Posts: 1343
Location: Saufend (Southend)
When i still had the original harness in the car there was a few open relay and fuse holes in the fusebox. You can get the pins to use these from most places i can send you links if you need them.

Should be at least 2 or 3 open slots. i used the ignition barrel to get a switch live but i cant remember which wire it was. Just get a multimeter and check each wire and see which ones are live and when.

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