comancheman Posted August 31, 2006 Share Posted August 31, 2006 hey guys, i just put a used motor i purchased I'm my mj. When i took the original motor out i marked everything so i new where it would go except for one connector, its on the same end of the harness as the coolant temp sensor and knock sensor its a three wire connector any ideas on where she goes? i can't find the other end. thanks alot, Tim Link to comment Share on other sites More sharing options...
Pete M Posted August 31, 2006 Share Posted August 31, 2006 Is it clean inside the plug or dirty? There are various plugs on MJs that don't really have a purpose on our trucks, but are still there because we share harnesses with XJs. Link to comment Share on other sites More sharing options...
aemsee Posted August 31, 2006 Share Posted August 31, 2006 what is the size and shape of the connector, and what year is your truck? Link to comment Share on other sites More sharing options...
Eagle Posted August 31, 2006 Share Posted August 31, 2006 Is your truck a 5-speed? If so, there are a few connectors (including at least one 3-terminal one) that relate to the auto trans and aren't used on the 5-speed trucks. Link to comment Share on other sites More sharing options...
comancheman Posted August 31, 2006 Author Share Posted August 31, 2006 its a 1990 with the aw-4 the plug looks clean I'm pretty sure it was used before its a black plug with a green seal it connects three wires Link to comment Share on other sites More sharing options...
4play Posted August 31, 2006 Share Posted August 31, 2006 Sounds like a plug I unhooked when I was removing the fuel rail for some injector cleaning / o-ring replacment. IIRC, there were 2, one for 2 wires, one for 3 wires; both near the firewall, running across the motor. Sorry I can't be more helpful. :dunce: Link to comment Share on other sites More sharing options...
Xacto Posted August 31, 2006 Share Posted August 31, 2006 The manual shows three plugs at the end of the harness that runs across the fuel rail: coolant temp, knock sensor and a three wire oxygen sensor connector. I can post the wiring diagram for that area if you need it. Link to comment Share on other sites More sharing options...
comancheman Posted August 31, 2006 Author Share Posted August 31, 2006 Thanks for the help guys. Xacto u got it, the reason theres no connector is because theres no o2 sensor on the truck right now, :oops: what an idiot Link to comment Share on other sites More sharing options...
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