Engine wire harness

Tiny
SKEETALLOVERU21
  • MEMBER
  • 1992 DODGE DAKOTA
  • 3.9L
  • 6 CYL
  • 4WD
  • MANUAL
  • 200,000 MILES
Engine wire harness got wrapped around drive line, I have two wires I don't know where they go: orange and green wire and A thick blue wire on the driver side under the hood.
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Friday, May 13th, 2022 AT 10:04 PM

9 Replies

Tiny
JOE F
  • EXPERT
Hi,

Does the vehicle run? I ask because looking through schematics is difficult without a starting point or a specific problem. I noticed the injectors have a dark green wire with an orange tracer. This would prevent the engine from running, so let me know if that is the case. I also found a green/orange wire to the heated O2 sensor.

I went through six pages of powertrain management schematics and found no orange/green or solid blue wires, so it has to be from a different circuit. For example, lighting, computer-controlled circuits, or something different.

As far as a heavy gauge blue, that has to be running something with a large draw. If you try to follow the wires, can you tell where they go? I realize one end you don't know, but the opposite should lead somewhere or in a specific direction. Also, is it possible for you to take a couple of pictures of the wires and upload them for me to see? Is there anything not working that may help?

Let me know.

Take care,

Joe
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Friday, May 13th, 2022 AT 10:57 PM
Tiny
SKEETALLOVERU21
  • MEMBER
When it got wrapped around the drive line the vehicle stopped running all together and hasn't run since. It was running good before that, so I bought it from my buddy. He fixed the wires except the one I told you about but the thick blue wire if you put it to positive on the battery it turns on the dash lights without turning the key. Weird I will send you pics next.
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Friday, May 13th, 2022 AT 11:47 PM
Tiny
SKEETALLOVERU21
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And the other wire is an orange with green stripe.
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Friday, May 13th, 2022 AT 11:48 PM
Tiny
JOE F
  • EXPERT
Hi,

That is odd. If you follow the blue wire, I suspect it goes through the firewall into the vehicle, correct?

Let's try this a different way. Since it hasn't run since this happened, it would help me if I knew if there was spark to the plugs and fuel to the engine. See if it starts for a couple of seconds using starting fluid. If it does, then we know it's related to the fuel system. If there is no change, then we need to check for spark to the plugs.

Here is a link that explains how to test for spark:

https://www.2carpros.com/articles/how-to-check-for-ignition-spark

The idea that it won't run may actually help me. Let me know if you can check for those things.

Joe
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Saturday, May 14th, 2022 AT 7:40 PM
Tiny
SKEETALLOVERU21
  • MEMBER
It does not run, there is no spark. I wonder if the distributor shorted out when this happened because I checked the codes, and it is coming up twelve or a one and a two so twelve that's a distributor code, I think.
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Sunday, May 15th, 2022 AT 12:14 AM
Tiny
SKEETALLOVERU21
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I replaced the camshaft sensor when I bought the vehicle taking it might be that, but I still have no spark.
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Sunday, May 15th, 2022 AT 12:15 AM
Tiny
SKEETALLOVERU21
  • MEMBER
But if that blue wire makes everything come on it's got to be important comes from underneath the vehicle I believe and then it's the original cord splits off in like three ways, I think. I will go and send you pictures.
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Sunday, May 15th, 2022 AT 12:17 AM
Tiny
SKEETALLOVERU21
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Even with starting fluid no spark don't run it's. Spark related for sure.
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Sunday, May 15th, 2022 AT 12:22 AM
Tiny
JOE F
  • EXPERT
Hi,

I need you to check something. Approximately 12 inches away from the fuse/relay box, there is a large wiring harness. Open the harness and look for (I believe) a red wire with a white tracer. There should be a solder splice connection. This connection is the voltage supply from the ignition switch to the relay box. It splices together three relays to the ignition switch. The Auto start/shutdown relay, fuel pump, and power to the PCM. Commonly, this connection will corrode and come apart causing a no spark/no start condition.

As far as code 12, it indicated the controller has lost memory. It's likely from disconnecting the battery. (See pic 1) As far as codes 1 and 2, they don't exist. It should end with a 55 which indicates the test is complete.

Let me know what you find, and I'll watch for the pics.

Take care,

Joe

See pic below.
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Sunday, May 15th, 2022 AT 7:25 PM

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