24V Engine wiring harness interchange - Dodge Cummins Diesel Forum
98.5-02 Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission Ect..NO ADVERTISING .

 
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post #1 of 6 (permalink) Old 07-17-2014, 11:20 PM Thread Starter
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24V Engine wiring harness interchange

I'm going to tell a little story here, my apologies to those who desire a higher pictures to words ratio.

The other day I went out to try and start my 2001 Quad Cab Flatbed 2500 4x4 w/Auto, after it had been sitting for a few weeks, and it would crank but that was it. I did a little research, and I started to get worried that my VP44 had reached the end of the road, but I wanted to be sure before dropping the money. So I went out to crank it again, listening closely for the lift pump to run, and heard nothing. So I decided to make it a priority to get the FASS lift pump and FASS sump on the truck that I hadn't been able to find the time for previously. Things went nicely on the sump, and I then started to route the new wiring. I knew I wanted to pull the factory lift pump and fuel filter to free up the space, so it made sense to get them off to make the routing of wires easier. I pulled off the fuel filter housing, and this is what I found:



I had previously seen a cat crawl up in the engine bay, I had thought it was just hiding up there from my dog, but I guess it thought it had a new scratching post. Next time I see that cat, I'll drop the dog's leash. The other thing relevant to this story that you might notice in that picture is the block that get's installed by the dealer when they do the in tank lift pump mod, which I now know I have. (luckily I already had the sump)

The tag on my engine wiring harness lists the part number as 3947682. I called Cummins Bridgeway this evening and got a price North of $1000. (The details stopped registering for me after I heard the "one thousand") I can try to repair it, which I will, but the harness is in even worse shape than the picture shows, and it may be quite challenging. There are wiring harnesses on ebay for 24V trucks in a reasonable price range, but none with the part number I have.

So here are my questions: I have read that swapping engines year to year can be a bad experience, but what about swapping the wiring harnesses between years? Will all the connectors match up? Or did connections change when the sensors changed? Also, will I be able to work with the connections I have (or will get on a new harness) to be able to plug in the FASS wiring harness for my new lift pump and still have a fuel gauge indication? They are both on the same connection at the tank, but I haven't been able to properly trace them out yet. (because a bunch of *!%#ing wires are ripped apart)

Thanks in advance for any help.

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post #2 of 6 (permalink) Old 07-18-2014, 02:36 AM
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the easiest thing would be to find a 01 harness, then next would be a 02. A cummins part number will not be the same as a dodge one.

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post #3 of 6 (permalink) Old 07-18-2014, 10:44 PM
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your going to need a harness for an 01-02 as those had a different map sensor hookup and if I am not mistaken from a truck that's auto 4x4 also but don't quote me on that

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post #4 of 6 (permalink) Old 07-18-2014, 10:52 PM
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should just need one from 01-02. looks just like the harness we keep for fummins swaps.

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post #5 of 6 (permalink) Old 07-22-2014, 01:38 AM Thread Starter
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Do you think auto or manual would make a difference?

I pulled my old one out yesterday, and it looks to have all the same connections as one on ebay that is from an '02 manual truck. My truck is an auto.

There is another one from a '00 auto truck and it is obviously different. So I know not every 24v harness will fit.
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post #6 of 6 (permalink) Old 07-22-2014, 02:31 AM
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as far as engine harness, should be the same other then maybe vss. 98.5 to 00 are different then 01-02 because of changes in engine sensors.

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