Dodge 8 Pin Trailer Wiring Diagram

[Marieta Reeks]

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Does anyone know if the 1998 Dodge Ram/Cummins Dash light pull switch has a removable trailer wiring harness. Is the trailer wiring harness plug and play. Mine was altered by previous owner. If so can the oem trailer wiring harness be purchased and where?

I doubt you really want to run a new stretch of wire from the front of the truck. The closest plug for the bed wiring is under the drivers front tire. to my knowledge that is the only "plug and play" plug that the entire bed wiring goes to.

Is it possible that the 98 Ram 2500 did not have the oem harness when built? I do know on my 98 there are wires hanging down and hand wired and wrapped with black tape and my trailer brakes do not work properly. If there is such a harness available I would happily buy it to save the wiring job.

Somebody correct me if I'm wrong, but why would a harness run from headlight switch to a aftermarket trailer brake box...its activated by the brake light switch... don't make sense maybe I'm missing something

On my 98 the trailer wiring is made into the harness and just has a connector in the back about dead center built into the harness that goes between the tail lights. All I had to do was by the trailer plug with a short harness for a dodge that reaches to the back. If you use there set up you can even get a brake controller that plugs in under the dash and not have to tap into any wires or run any. As I recall the plug and brake controller can be ordered at U-Haul or NAPA.

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Hi -- So we bought our 2012 used a few months ago and I my hitch is coming tomorrow. I have been researching how to properly wire mine up... i looked on Etrailer and found a nice wiring assembly but then found some other

info on here, etc that some DJ's have a towing prep package already there near the spare tire. So i got under there last night to see if mine had this there, low and behold I found that wiring right under there... so i think this is good news for me.

3. Do i have to take to dealer to get this flashed to use this wiring assembly, and if so it sounds like I may have to pay for this... I have seen different conversations saying some paid and others said they didnt have to?

So i tried to pull this harness off the bracket it is on but didnt have any luck and i sure didnt want to break it off. Below is what i am seeing under the bumper, next to the spare tire, this is the wiring harness for towing, correct? I am still not sure what i should be hooking up to or connecting to this to get it to work, does anyone know?

It doesn't look like someone already installed the trailer wiring harness. Mine was just tossed in the back when I got mine new from the dealership. I ended up installing it (took about 10 minutes) and then hooked up the trailer. That was when i found out that the vehicle needed to be flashed for it to work. I ended up getting it done for free since I convinced the dealership they should have done it in the first place.

Thank you very much Darkpaw & oleaver.. I was leaning towards just buying the harness from etrailer b/c i wasnt sure if that was a real wiring harness but now after reading what you wrote I will definitely be doing so... appreciate your time to post on here about that. Thank you.

It doesn't look like someone already installed the trailer wiring harness. Mine was just tossed in the back when I got mine new from the dealership. I ended up installing it (took about 10 minutes) and then hooked up the trailer. That was when i found out that the vehicle needed to be flashed for it to work. I ended up getting it done for free since I convinced the dealership they should have done it in the first place. Bottom line, if you don't see a 4 pin connector back there already, you don't have the trailer wiring harness installed. Luckily it is a plug and play system and very easy to install. Good luck!

So what was included in the tow package? The only one I've found on the Mopar site was a full harness that required drilling holes in the jack box and wiring to the taillights plus two circuits to the battery. Lets assume that the connector contains Right & Left Turn/Brake lights, Tail Lights, Backup Lights and Brakes and that you get ground from the frame or no brakes and it has ground. Does it connect directly to the plug or does it wire to a controller then the plug? How much can it drive?

The part number for the wiring harness "kit" (includes the plug 'n play harness and the instructions in a bag) is P68080976AC and inside the bag is a part number attached directly to the harness (use this if you want just the harness and not the whole kit) P68080977AC. This kit will attach to the plug in the rear and give you the 4 pin connector. The "P" just indicates the following is a part number and you should be able to look up the kit by the number and two letters following them.

I ordered the P68080976AC kit today from my local dealer as they can not find P68080977AC their system. Should be in tomorrow. Ill let you guys know how it looks and if it indeed fits once it comes in.

I live in the middle of no where do we pay more then most. It was $120 Cdn. I'm not sure if the flash price yet as I have to chat with the sales team about the detailed scratching my fender on inspection and tried to hide it.

Could you take 4 close up photos of the wire area on the 3 relays and the connector to the Journey. Don't need the trailer connector since it's visible in one of your photos. I'll match that up with what I have already figure out. If the photos are clear enough I can likely make a schematic from them. I'd also like a picture of the relay brand and part number if they are marked.

Traced out the wiring on the connector. The part is made by Delphi and is in their standard catalog so depending on who carries them they should not be too hard to find. The mating part is 12103974 which is the part you see the connector plugged into. All you need to turn the dummy connector into a live one is the pins and wire seals. The pin I think is 12045773 0.80-0.50 Tin Brass Tin plus the wire seals. If you interested look at the Delphi Catalog starting around page 2.12.

One of the things I don't like about the factory connections is that it looks like they use 18GA wire. That seems a bit light to me mainly for the ground. If you were going to use this cable plus a 7 pin connector it would be easy to beef up the ground and get additional power from the battery for the Aux Power, Backup Lights if used and Brakes.

The part number was taken from a kit in a Journey with the tow package. It should work with any Journey that has the matching connector in the rear just behind the bumper. We don't know if it's on all Journeys or just the V6 ones.

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One of the hardest if not impossible hurdles for a Technician to overcomer is incorrect or missing service information. When service information is wrong or missing all together, it makes diagnosing a vehicle the first time almost impossible. A massive amount of time can be consumed trying to find the information needed, add to this a flat rate pay system and low warranty times and you can create the perfect storm for a mis-diagnosis. I've also personally seen this lead to new car buy backs and lemon law cases. For all the start up companies automotive companies, this article is for you. Learn from the mistakes of others, take your time and be diligent when producing service information for your technicians.

During a project I worked on for an OEM I had the opportunity to see how the engineering diagrams for the wiring harness routing could be useful in finding problems. Unfortunately most of the time, those diagrams never make it to the dealer/aftermarket service information portal. My job with this OEM was to diagnose electrical defects that would cause failures as the vehicle went through the assembly line. We would document damage found and repair the wiring harness or connector during re work. As a re work technician we would notice areas in the vehicle where there was a high probably of wires being pinched or cut. This information could prove to be extremely useful in a dealership setting, considering many times the wires were pinched behind the dash or under the carpet. One instance in particular I noticed a harness had been incorrectly routed and pinched a Can Communication line, after checking several vehicles still going down the line, they were all the same. This was an area behind the dash that the harness could rub through over time but not necessarily fail while the vehicle was still in the plant. This information if passed on to the dealership technicians could save time and effort when it came to diagnosing intermittent problems under warranty. I know some manufacturers use this information for service bulletins while others choose to do nothing with it like in my experience. This is just one example of missing information that could be helpful.

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