View Full Version : 2.9 to 4.0 wiring harness help

04-20-2009, 10:54 PM
Alright, so i've got an '89 ranger that had the 2.9 in it. I swapped in a 4.0 from a '91 ranger. I am having huge wiring issues. I am using the 2.9 stock harness, and the 4.0 engine harness ,and am trying to adapt the two together. I have already plugged the 4.0 computer into the stock 2.9 harness. The two plugs on my alternator also clipped on. Besides that, there is one black 8 prong connector that hooks up to the the 4.0 harness. I am not sure if it is correct or not.

Which wires do i splice together ? I have a complete 2.9, and a complete 4.0 wiring diagram. Where do i start ? Im really losing motivation, but i NEED to get this done for friday. I am unsure as to what each connector does.Any help is appreciated !! Thanks !