5.9 mag, EFI into 72 charger. 1st hurdle. EFI wiring harness. Pics, not soon.

[XXSpiralXX]

     Okay this is going to be a really slow thread guys, but I have to start somewhere. Im taking out the entire engine harness from the 98 grand cherokee to put into my 72 charger that way I can run the factory efi. The goal here is to save the money otherwise spent on an aftermarket efi system.  THe first problem I have is how to remove the harness from the firewall in the jeep ? I was told I should cut it then rewire it into the fuze block later. Seriously? I figured that would be disaster as I have NO IDEA what im doing with the wiring.  Is there a way to disconnect it it all in one piece? I already have the computer out, and so far everything is still hooked up to the motor, that way I can tell what goes where. I havent had the time to label everything yet. The parts jeep has to go out ASAP so I will try to label it all later.

Also, what should I keep from the engine bay and what should go? I dont need all the emissions stuff as the car will be exempt but what would cause the engine not to run if eliminated? Stuff like the ABs sensors and whatnot you know? Ill post some pics of my progress as I have the time.

[Rolling_Thunder]

If it is free - take everything that connects to the harness - sort out what you need later. Next find a factory wiring diagram for your Jeep so you can post it and we can tell you what you need / don't need.    I would NEVER cut the wiring harness. It can be removed in one piece - just need to disconnect stuff. You should also snag the OBDII connector and any other wiring that goes to the engine harness.     

[Budnicks]

Try, www.mymopar.com , for the wire diagram/schematic, for your specific year of Jeep & Charger wiring, they may help some....

[Rolling_Thunder]

nothing that new on mymopar.com      ---   

[Cooter]

Most times, the ENGINE ONLY harness can be removed by itself, but be prepared to have to cut and LABEL a few wires as they go through the bulkhead and into another harness for things like Dash. A/C, etc.

This is why I'm running a Mustang GT Harness trying to do the same thing you are. I can't see $4K for EFI when the junkyards are littered with 'em.

[Budnicks]

nothing that new on mymopar.com      ---   

The Charger will be there but, your correct the list only goes from 55-76 for wiring schematics... Sorry for any confusion, maybe at www.fortruckonly.com/forums or www.DodgeDakota.com/forums , lots of truck guys over at www.forbbodiesonly.com , someone will have a good suggestion

[XXSpiralXX]

  Okay, so I have to get the truck out of here by the middle of the week so I am just going to cut the harness at the firewall and then remove the interior harness seperately. I'll splice the two together later on.
  I called up Hotwires, and they told me that I wont be able to use the jeeps computer because it's set up for an automatic, and they can't reflash it, or program it to work behind a non computer controlled transmission or a manual. I have to go get a computer from a Ram that had a manual trans and the same motor, THEN have them reflash it.   Rrrgghhh.    
 As far as pics go, between my charger and the jeeps wiring I have a 1 gig card full of pics, but now my computer isn't recognizing the card   soooooooo when I sort that out you guys will get half a projects worth of pics all at once  
  Budnicks , thanks for the B bodies only link, good site !

[SG1022]

I'm definitely in for this one. Make sure to post your progress, and the answers you get! I am looking to do something similar soon.

[XXSpiralXX]

 Engine harness removed from the jeep, now working on the dash harness. SOrry for taking so long so far lifes hurdles got in the way and Im no track star. I spoke to somebody in the local dodge dealership and he said I need to take the column too, because the ignition key and dash computer are required to make the engine run with the stock computer. THe more I look into this the more I realise I am going to have to find another computer. Once I do that I think I will be able to just use the connections to the motor and the OBDII port. It SHOULD work then with a computer reprogram. Damn camera card is still not working btw.

[Rolling_Thunder]

As far as I know the 98 did not have a security lock feature in the column...   The newer Jeeps, LX, and LY platforms do...      maybe the dealer guy was confused.    you should only need the PCM with a couple wires hooked up (12v, Ign, ground, fuel pump) to get the thing fired up. 

[Budnicks]

 Okay, so I have to get the truck out of here by the middle of the week so I am just going to cut the harness at the firewall and then remove the interior harness seperately. I'll splice the two together later on.
  I called up Hotwires, and they told me that I wont be able to use the jeeps computer because it's set up for an automatic, and they can't reflash it, or program it to work behind a non computer controlled transmission or a manual. I have to go get a computer from a Ram that had a manual trans and the same motor, THEN have them reflash it.   Rrrgghhh.    
 As far as pics go, between my charger and the jeeps wiring I have a 1 gig card full of pics, but now my computer isn't recognizing the card   soooooooo when I sort that out you guys will get half a projects worth of pics all at once  
  Budnicks , thanks for the B bodies only link, good site !

xxspiralxx, your welcome there are some great guys/gals there too, very knowledgeable Mopar people...