I transplanted 1999 Ram 1500 5.2L and 46RE along with the engine harness & PCM to a 1940 Chrysler Royal. I did not take any of the emissions stuff.

I merged the 99 engine harness into a 96 Dakota 3.9 Harness to get all the fuse box, lights etc. This was a lot of work!!!

So, the engine starts if we dump fuel manually into the throttle body and runs as we spray fuel into TB.

The ASD relay is not seeing power on pin 85, and I suspect same for the fuel relay. And so no fuel signal to injectors and no fuel pump.

I think this would be due to PCM not seeing the Leak detection pump and other emissions stuff?? or????

Maybe I need a PCM for hot rod application?

Thanks in advance, Mike

Fear of having a problem like this one is the reason we bit the bullet and bought a Hot Wire harness when we did my son's wagon the first go around.

On a 93 Dakota, the ADS relay and the fuel relay both power through the ignition switch (same power source as the cam sensor and the throttle position sensor) on first start up. The wires that provide the power to both relays are the same wires some of the early Dakota's had a problem with because of corrosion. The junction that often fails is a connection where 5 or 6 wires are crimped together with a single crimp, about 12" from the under hood fuse box (almost directly under the fuse box on my 93). It is possible that with all the moving of the wiring and the boxes that that wire crimp has failed. The wires are very small and could break pretty easily. I would start there since you used the Dakota fuse box, its about the easiest starting point.

I have no idea how they powered the relays in the 99 Ram, and I have no idea what pin 85 is suppose to have, or not have. Good luck! Gene

I did something similar a few years ago, I used part of my 99 truck harness in my 97 truck harness in a v6 to v8 swap. I left all my emissions stuff in there tho, and now those plugs don’t go to anything under the hood, but they are there, but I never had any problems like you’re describing. I’m wondering why you had to combine harnesses to get lights and things, that I don’t understand ? All you got with the engine was the stuff connected to it or why did you have to merge two harnesses ?

I merged the two harness because the Dakota engine connectors were not the same as the 99, and routed differently than the V8. Also the Distribution box is very large on a 99 Ram, where the Dakota was half the size and contained the necessary relays for ASD, Fuel and Transmission.

Mike

Poorboy, I will look for those wires you describe, they are near the Distribution Box in the engine bay and not the fuse box under dash correct?

Mike

Correct, near the distribution box in the engine compartment. The connection can be any place between the distribution box and where harness neared the master cylinder before it split to go into the cab, or across the firewall. I've seen it in several locations along that stretch. My 93 was below the distribution box, but I fixed that connection on one 95 that was closer to the master cylinder and a second 95 that was about mid way between the other two points. I believe one of the wires in that connection also goes to the computer, maybe that is your dead #85 pin? Gene

Right, the distribution boxes are different between those few years, that’s why I wasn’t able to use the engine harness from my wrecked 99 ram in my 97 ram. I guess I just don’t understand why you’re having to combine harnesses in the first place. Stuff is going into a 1940 vehicle right so why not just use the 99 harness completely. Maybe I just need to read your original post a few more times to get it, haha.

BleedDodge, I could have pulled the complete harness from the 99 Truck, but it has so much other stuff I didn't want. The Dakota is a much simpler wire system. I wish I had waited until a V8 Dakota was for sale, and used all of that harness. Not many 96 Dakota in these parts anymore.


Mike

I think I know whats causing the no fire at the injectors. The 99 Ram had anti-theft security via a chip in the key. And I bet the computer is looking for that and not seeing it. So I need a computer that runs the 5.2 and the 42RE trans that does not have anti-theft function.

Any suggestions what vehicles have OBD2 without the security?

Mike

I'm using the computer from a 97 Ram in my 39 pickup, it does not have the security chip, because I'm using a column from a mid 80s Mopar and it works fine. Then again, I'm running the Hot Wire harness, so this may not transfer very well, good luck. Gene

i have a 02 grand cherokee that had a security key problem,i sent the computer to a guy in ohio that deleted it for me $140
found him on ebay

More info, the 99 Ram does not have a chip in the keys. But it did have VTSS system programmed in the PCM, and I did not take the Central Timer Module from the 99 Ram. The CTM talks to the PCM by the +CCD and -CCD so this must be whats causing the no start.

I found a yard that has a few 96 thru 2001 Rams and will grab the PCM and CTM from one of them. I would really like to find a 96 5.2L Dakota PCM it has none of the security stuff on it.

We will get there....the hard way.

Mike

Major success over the weekend. We found a PCM from a 96 Ram and 97 Ram tried both and the motor fired up and idled. So the issue was the Anti theft system on my 99 PCM.

I attached my chart between Ram and Dakota showing what wires needed to match between the Ram engine harness and the Dakota harness. This was a lot of work looking at the two service manual schematics.
You can see the wires from the Ram eng harness just below the Dakota bulkhead connector and a few wires soldered going into the Dakota harness.

Mike

Shaker340, Congrats! Nothing better then success when a person undertakes projects like this, has a problem, then finds the fix. Good job.

The next big task is to make the bundle of wires look presentable. At least the 40 Chrysler Royal has front fenders you can attach the wires to and keep them out of trouble. Gene

Gene, many thanks for the compliments. You were a major inspiration and resource as we travelled down this path.

Wires wrapped in harness tape, convolute tubing to follow once we get the front end on.

Mike