[ryanhearn]

Ok, The engine is swapped and not starting. The wiring harness is different than the harness on my crashed 2004 truck. The computer is obviously different also and they do not connect. I have read all this crap about changing from 32 pin systems to 16 pins system and vice versa. also heard about having to change cam sprockets or something. Where do I go from here. The harness in the existing 2001 truck with the 2004 motor all hooked up great. I had to take out a sensor on the intake and exchanged with the other mother so that the plug would connect and change throttle bodies because a sensor on the throttle body was different for the plug. Also took the power steering pump hose and exchanged it because the 2001 harness had a sensor that connects to the hose. so now all my connections are great. I am guessing that I will have to change wiring harnesses now to accept the computer that is still on my 2004 truck. can anyone chime in here with a direction I should head that is the most easiest way to get this thing started?How much of the harness do I ave to change and will I have to do any splicing? Primus, you seemed fairly knowledgeable about my situation. Whats the next move?

Well. I went ahead and changed out the wiring harnes and computer under the hood. I still cant get it started. I have only been able to connect 3 of the four plugs into the computer under the hood. The white plug routes to the head lights and the front if the truck then back into the fuse panel and back into the truck fire wall. This white pkug may contain something nexcessary to start engine. Thinking it may be easier to splice wires then to cjange fuse box and see whats behind the fire wall under the dash. Who knows maybe there is something i have t change under the dash. Can anyone help here? I am at ends and noone has chimed in for a while. Thanks


Here are pics of the computer and the old plug that needs to be replaced with new style. After going to thebfront end of truck, it goes the fuse box and then through the firewall. Like i said i havent seen what under dash and havnt had the time. I have about 25 hours into this truck and was just exhausted and it was getting dark.


Check out pics in my original thread

 

[RXT]

Computer stuff is always a royal pain in the neck….. It's often better to swap harnesses with the engine if possible. Incompatible electronics are always difficult if not impossible to modify. If you can swap out the entire harness with computer, you'll be in a better place. As for starting the engine to see if it starts. You can always attempt to hot wire the starter from the battery, to at least see if the engine will crank. But without the right harness and computer, it may not want to run

Ed

 

[ryanhearn]

Like i was saying, i changed the computer under the hood. Is there another? Because the computer i installed has 4 recepticals and thw old one had three. There is one plug left and it is not compatible with the new computer. That one plug of wires that leads to the front end of the truck then back into the fuse box. Then all the wires run into the fire wall and into the truck under the dash. I dont know if they all go into one centralized unit under the dash or split up from there.

 

[ryanhearn]

Here are the pics

 

[ryanhearn]

As no one replies i learn as i go. I removed the harnes that goes to the fuse box from my wrecked truck. I figued that it was thebplug of wires that is sending power to the computer. Rather than splice and end up with a mess i am goin to replace wire harness and see how it goes.

 

[RXT]

Because the computer i installed has 4 recepticals and thw old one had three.

Thats my point, it's possible you have the wrong computer, wrong harness or both, because it sounds like you got incompatible components… Computers do change over the years. A computer from an 01 may not work in place of an 04 and vise-versa. Anytime you do an engine swap on a modern computer controlled engine, the harness and computer are always part of the swap.

I had to deal with a similar problem when I swapped cabs. I replaced my 99 cab with an 01, and the 01 had a redesigned dash. To make it all work, I had to pull out every harness in the truck and swap it into the new cab, complete with dash, steering wheel, fuse box etc.

Ed

 

[ryanhearn]

Replied my update to other participating thread. Check it out.

 

[ryanhearn]

Heres my problem. I totaled my 2004 dodge dakota truck and bought a 2001 dodge dakota truck with a blown head gasket. Well the engine finaly shit the bed so i did the swap from the 2004 to the 2001. Changed the engine, 4.7, and both wiring harnesses along with the different 4 plug pcm tcm sice it was different. I was told that the 45rfe would work in the truck and computer would tell it what to do. Truck engine runs great with no codes at all. The truck drove for about 30 minutes with no issues at all. Then, The transmission throws codes p0700, a code p0755 for shift solenoid b. I erased the codes and disconnected battery then reconnected battery. Drove off again and it did the same sputtering in first gear and drives like normal at higher speeds but seems that it will not shift down to lower gear when stepping on the gas to pass someone. There is no effect when i switch overdrive off or not. After erasing code reader shows the same p0700 which i understand is general saying there is another tranny problem plus that and now p2706 shift solenoid F. Both transmissions wirked perfect before the swap if engines and like i said the 45rfe work for about 30 minutes no problem before it started to act up. Again i was told it would still work. The original tranny that matched the 2004 motor that is now in the truck was a 545rfe. So, after all that said what do you thing the problem may be? I bought a filter and gasket system and was going to change that out today thinking it would work correctly. Do you think a flush or back flush may clean something out while changing filters and gasket? Isbthe tranny not a direct fit to work with 2004? Should i just change out the 2004 545rfe tranny or is there something i can do to make this pig work? Let me know your ideas and professional advise and that would be awesome asvi have been doing this switch for 4 days now.