Quote:
Originally Posted by 169mph
I’ve never installed or replaced an existing ECU harness. Is there a reason you can’t replace the existing harness connectors with the connectors from the ‘99-‘o4 harness? Thanks got h he
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If you buy the MS3Pro Ultimate it will come with a harness that you need to cut to length for your install and crimp on the appropriate connectors, just as Tony has suggested.
If you buy the MS3Pro Plug and Play, the ECU box has a connector on it that exactly matches the OEM Ford connector on the OEM ECU pin for pin. It expects to see an OEM Ford harness — hence the salvage yard or dealership (long shot) alternatives I suggested.
If you go the PnP route, some harness wires will be long and some will be short. You job at that point is to lengthen the short ones and shorten the long ones.