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Old 03-27-2014, 06:04 AM
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7.3 Transmission Wiring Harness

I am trying to help a friend locate a wiring harness for a 99 7.3, truck is a 4x4 but not sure if that makes a difference. Does anyone know what all years will interchange and does it need to be from a 4x4 truck or can a 2wd harness work and the transfer case is separate harness?

Also if anyone has a spare or parts one they would part with let me know.
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Old 03-27-2014, 06:53 AM
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Also does anyone know if the harness would be the same from a Expedition, Excursion or F150 that has the 4R100?

Last edited by cory99; 03-27-2014 at 07:19 AM.
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Old 03-27-2014, 08:22 AM
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Is ur truck auto t-case or manual? And 99-03 7.3 with the same tranny and tcase will work. If the excursion is a 7.3 and has the same t-case it will work


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Old 03-27-2014, 08:26 AM
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Thanks I believe it is manual Tcase will have to ask him to verify. But basically only a wiring harness from a 7.3 will work and not a 2wd? I havent seen it but he thought the transfer case harness was separate from the transmission
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Old 03-27-2014, 08:47 AM
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If it's a manual t-case a 2wd will but then your 4x4 light won't work and if you have auto locking hubs they won't work either.


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Old 03-27-2014, 09:19 AM
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I wouldn't think the 02-03 harness will work, There is a lot more wiring around the tranny in those years.

OP stick with the 99-01.5 and get one from a 4x4, its all the same harness
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