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Eng light on = go to Autozone or Advance or someplace like that. They will read the code/s for you free.
Start by checking your fuses. You really have to look to find all the different diagrams. You can get an alldata subscription for just one car at a low price which should give you all the info you want. I have found the wiper motor connector and the shift solenoid wiring diagrams.
It would certainly be much easier to stay with a GM drive train.
Everything the Chrysler setup touches would need to be modified.
Wiring, exhaust, cooling, even the driveshaft. And that work would make the truck worth much less than if it had a stock drive train.
You might have a short in the headlight switch itself. I would check the positive side of the taillights to see if they are shorted to ground. Not sure on a manual, besides All-Data.com. You can also purchase it thru Auto Zone.com.
I've done several of these swaps that sound good at the time but end up being a Huge problem.I would start with the correct harness for the engine you've put in.It must include the under hood harness and what ever harness connects to it thru the firewall to the computer.You'll also need everything connected to the transmission to the computer including any thing connected with the brake and accelerator pedals.Next get the wiring diagrams from Jeep or buy the Chilton or Haynes manual,they have the diagrams included.Get the harnesses connected to the engine,trans and computer,then work backward towards hooking up everything else.I really feel your pain,I've put 20 year newer engines in older cars,V-8's where 6's were,an olds V-8 where a in-line six was(ford),Late model v-8 in a 59' Chevy.All these were simple compared to what your going thru.Please contact me if I can be of any help?
Go to an auto parts store and see if you can have a look at some electric brake modulators and trailer connectors they almost always have instructions in them that detail standard colors for any install. The standard diagram is often right on the back of the connector package.