Need wiring harness for EFI Magnum

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autopar3000

autopar3000

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Hey guys,

I'm swapping a 1994 5.9 into my 71 Dart and I'll be using the factory EFI. I noticed my engine wiring harness is hacked up and the connector is a bit crispy. I like my fried chicken to be crispy, not my wiring, so I'm going to replace the harness.

I see that Year One has HU203A, which is for points ignition: 1966-74 A B E-Body Engine Harness 1971 Plymouth Dodge A B...

And they have HU230A for electronic ignition: 1966-74 A B E-Body Engine Harness 1971 Plymouth Dodge A B...

Given that I'll be using the factory EFI, which of these harnesses would make the most sense for me to buy?
 
autopar3000 said:
Hey guys,

I'm swapping a 1994 5.9 into my 71 Dart and I'll be using the factory EFI. I noticed my engine wiring harness is hacked up and the connector is a bit crispy. I like my fried chicken to be crispy, not my wiring, so I'm going to replace the harness.

I see that Year One has HU203A, which is for points ignition: 1966-74 A B E-Body Engine Harness 1971 Plymouth Dodge A B...

And they have HU230A for electronic ignition: 1966-74 A B E-Body Engine Harness 1971 Plymouth Dodge A B...

Given that I'll be using the factory EFI, which of these harnesses would make the most sense for me to buy?
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Get which ever one is cheaper, as you won't be using most of the connections. The Hotrod harness I bought from Hotwire Electric hooked up with 4 wires. The large cable from the alternator to the battery I made myself. The gauge wires are about the only thing you will use on the factory harness.

Isn't '94 an OBD1 system? Why not upgrade to OBD2 while you are at this stage?
 
That's what I was thinking. I sure don't need the harness for the old orange box, so thinking I should get the cheaper one without the electronic ignition wiring. I just didn't know if there was something else on the elec harness that I might need for EFI.

The 94 engine is indeed OBD1, and I might upgrade it to OBD2 at some point, but for right now I just want to get it in the car and get it running! Besides, I would need to source a new computer and I believe some sensors are different.
 
autopar3000 said:
That's what I was thinking. I sure don't need the harness for the old orange box, so thinking I should get the cheaper one without the electronic ignition wiring. I just didn't know if there was something else on the elec harness that I might need for EFI.

The 94 engine is indeed OBD1, and I might upgrade it to OBD2 at some point, but for right now I just want to get it in the car and get it running! Besides, I would need to source a new computer and I believe some sensors are different.
Click to expand...

I built and ran mine in 3 stages and am planning a 4th version of the Magnum soon. All 4 will use the same ECM which was remote tuned by Chris at Performance Injection Equiptment. He knows his stuff, and is a great guy to work with.

https://www.performanceinjectionequipment.com/

The throttle body has 3 of the sensors on it, and used ones are everywhere for cheap. I also changed the injector harness to use a different plugs.

I used Solo PCM in Florida. They sold me an ECM for a 1999 stick shift 5.9 Magnum pick-up without the key security for a very reasonable price, which I can''t recall now. I didn't need a transmission control module , as I'm running a modified 2004R transmission from Extreme Automatics. It's the best automatic I've ever driven.

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Airbox1 (Medium).JPG
 
I'm looking at following much the same path that you did. I want to get it going first, then start with the upgrades and improvements. Adding power steering is part of phase 1, phase 2 is probably OBD2 and add AC.

Phase 3 is the OD trans. The Mopar RH automatics are probably the easiest way to go, but I'm not against the idea of using a GM trans or a Gear Vendor unit. I've heard about a lot of people having success with the 2004r, so it will be on my list of options. The GV unit doesn't have a very aggressive ratio and if I'm going OD, I wan't some serious OD. If you don't mind my asking, do you remember what the 2004r ended up costing all in?

I love that air filter housing you have. Where did you get it? I'm looking for something similar that I could plumb right into the scoops on my hood (70 Swinger - check my avatar).

Thanks for the advice and recommendations. When the time comes I'll certainly look into those guys.
 
autopar3000 said:
I'm looking at following much the same path that you did. I want to get it going first, then start with the upgrades and improvements. Adding power steering is part of phase 1, phase 2 is probably OBD2 and add AC.

Phase 3 is the OD trans. The Mopar RH automatics are probably the easiest way to go, but I'm not against the idea of using a GM trans or a Gear Vendor unit. I've heard about a lot of people having success with the 2004r, so it will be on my list of options. The GV unit doesn't have a very aggressive ratio and if I'm going OD, I wan't some serious OD. If you don't mind my asking, do you remember what the 2004r ended up costing all in?

I love that air filter housing you have. Where did you get it? I'm looking for something similar that I could plumb right into the scoops on my hood (70 Swinger - check my avatar).

Thanks for the advice and recommendations. When the time comes I'll certainly look into those guys.
Click to expand...

Thank you. The overdrive is the single best thing I did to my A-Body, followed by EFI and BBP 4 wheel discs.

I found the 2004R was easier to install because of the bolt on bellhousing and you don't have to cut the floor pan to get proper driveline to rear end pinion relationship. It also takes less power to spin, has better gear ratios and it performance is awesome when built properly. I opted for a 3800 rpm stall, lock-up torque converter option, which essentially makes it feel like a 5 speed overdrive

Either way you will need to modify the torsion bar cross member for clearance and fab or buy a new cross member for the rear trans mount. The RH requires you also modify the floor pan.

The air cleaner is from a guy in Canada. You will need to fabricate a sealed platform from the air cleaner to the hood, which shouldn't be that hard.

200R4 3 (Medium).jpg


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