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Old 05-04-2012, 03:34 PM   #1
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SOHC 2003 Chassis Swapping in 2002 DOHC

I've searched quite a bit and have seen many of the swap writeups on this topic. The question I don't quite see a clear answer on is this.
-Is there a known month in the mfr'd date where the electrical wiring harness was changed? i.e. was it 5/2002 (any Focus mfr'd in 4/2002 or earlier will have a different wiring harness than 5/2002 and later?)

Also, specifically which wiring harnesses changed? Were the changes just to the ECU connections and the dash wire harness?

If I have a 2003 SE with SOHC/AT and want to swap from a donor Focus that is a 2002 ZTS sedan or ZX3 that is 4/2002 or older does it really matter much since I can swap all the wiring harnesses over from the donor vehicle? or is it a real pain to pull all the changed cables out?

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Old 05-07-2012, 09:29 PM   #2
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My Focus was manufactured 5/2002 and it is the older style connectors (00 to 02.5 style). The easiest way is to look at the connector that hooks to the engine harness -- if its rectangular then it is probably the 02.5+ and if it is more square then it is a 02.5-. If you have any doubt just post up a pic of it and I can tell you.

The wiring harness you change is the one that runs from the fuel pump, through the cabin up to the ECU, then through the firewall into the engine bay. It then connects to an engine bay wiring harness and also into the trans.

If you have an 03 SOHC I would use 02.5+ wiring throughout to make sure you don't run into any trouble. I'm pretty sure if you wanted to switch to 02.5- wiring you would need to pull the dash and do that wiring as well.
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