The best technical support and full Custom Fit Vehicle Wiring installation instructions. Lowest price Pacifica Custom Fit Vehicle Wiring guarantee and expert service. Chrysler Pacifica, 2005 Custom Fit Vehicle Wiring by Tow Ready are available from For expert service call 800-298-8924 to order your T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector part number 118303, or order online at
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Tow Ready Custom Fit Vehicle Wiring for the 2005 Pacifica by Chrysler

Tow Ready Custom Fit Vehicle Wiring

(29 reviews)

Code:   118303



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T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector - 2005 Pacifica by Chrysler

Quickly and easily install a 4-way trailer connector on your Chrysler Pacifica with this custom wiring harness. T-One connector plugs directly into existing wiring - no cutting, splicing or tapping required. Powered ModuLite reduces strain on wiring system.


  • Provides a 4-way flat trailer connector at the back of your Chrysler Pacifica to power your trailer's signal lights
    • Compatible with 5-pole, 6-pole and 7-pole adapters (sold separately)
  • Connects quickly and easily - no cutting or splicing of wires
    • Locate connection points behind tail lights
    • Plug in T-connector
  • Includes ModuLite to ensure that your Chrysler Pacifica's wiring matches that of your trailer
    • Powered module connects directly to battery to avoid overloading vehicle's electrical system
  • Constructed of 16-gauge bonded wire
  • Comes with dust cap for 4-way flat connector


  • Maximum amperage:
    • Stop/turn lights: 2.1 amps per circuit
    • Tail lights: 4.2 amps per circuit
  • 1-Year limited warranty


This custom-fit T-One connector plugs into your Chrysler Pacifica's wiring harness, which is located behind the driver's-side and passenger's-side tail lights. You will have to remove the tail light assemblies to access this harness.

T-One Connection Location Points Behind Tail Lights

Once you've plugged in the T-connector, locate the "towing fuse" position in your fuse box and insert the included 20-amp fuse.

Once installation is complete, the 4-way flat connector will be stowed beneath your Chrysler Pacifica, near the trailer hitch. A mounting bracket (sold separately) is recommended to keep the connector secure.

It is recommended that you use a small amount of grease on all electrical connections - the plugs on your automobile and the 4-pole connector itself - to help prevent corrosion.

ModuLite Powered Tail Light Converter

A ModuLite power module is built into this T-One connector. Because most trailers run on a two-wire system - wherein the brake and turn signals are carried on one wire - the separate brake and turn signals from your Chrysler Pacifica's three-wire system need to be combined so they are compatible with the wiring system of your trailer. This power module functions as a tail light converter to combine the brake and turn signal functions of your automobile so that they run on one wire to properly activate your trailer's tail lights. Note: This will not affect how the tail lights on your Chrysler Pacifica operate.

With a ModuLite, your trailer's lights will be powered without overloading your Chrysler Pacifica's electrical system. Because the module draws power directly from your car's battery and bypasses the electrical routes that are used by a basic wiring harness, there is virtually no draw on your tail light circuits.

118303 Tow Ready T-1 T-Connector - 4 Wire - Modu-Lite

Video of T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector

Videos are provided As a guide only. Refer To manufacturer
installation instructions And specs For complete information.

Video Transcript for Trailer Wiring Harness Installation- 2005 Chrysler Pacifica

Today on this 2005 Chrysler Pacifica we are going to install Tow Ready T-One connector part number 118303. First, we are going to open the tailgate so we can access the mounting bolts for the drivers side tail light lens. We are going to remove these two mounting bolts here. Now that we have the two mounting screws removed we are going to remove the tail light assembly. Be careful not to break the alignment tabs that are still connected. As you can see here, it gives us access to the rear tail light wiring. Now that we have the lens assembly away from the vehicle, we need to locate this red wire connector which will be attached to the manufacturers wiring harness. We are going to pull it up and out of the vehicle and connect our new Tow Ready T-One harness to it. Then, we will slide the locking tab into place. 1:02

Now what we need to do is make an area in this grommet using a utility knife or scissors. We are going to cut a hole in the grommet or a slit so that we can reinstall it with the wire. Then, try and feed the wires back into the vehicle and then reinstall the grommet. When the power wire is in place, unlock the red locking tab and press on the connector locking tab and disconnect it from the tail light lens assembly. You can see here I have the red, yellow, and brown wire connector of the new Tow Ready connector. We are going to plug it in line with the manufacturers wiring. We will snap the connector in place and lock in the red tab. We will take the manufacturer connector and Tow Ready connector and lock them into place and again snap the tab. Then, take the remaining wires and feed them down through the body of the vehicle. 2:11

Go ahead and pull the wires out underneath the vehicle that you fed down earlier. First, take the green and white wire and feed it up over the bumper bracket support. Now we are over on the passengers side and we will want to go back up the same hole between the body and bumper structure as we did on the drivers side when we came down. Key things you want to stay away from are points that move and heat such as the exhaust. Pull the wire up we routed to the passengers side and we can connect it in line with the manufacturers harness, just as we did on the drivers side. Now we can reinstall the passenger side tail light lens. 3:07

We are going to go ahead and route the 4-pole and we want this to come out near the center of the hitch. With the 4-pole routed, we can go ahead and mount the module. You can see here it has double sided tape on it. We will want to clean a spot behind the tail light lens and stick the module to the clean spot. With the module secured, we can reinstall the tail light lens. Now we will want to secure the wiring we have already routed. We will just use some black zip-ties. There is a little extra wire here, and I am just going to bundle it together and use a zip-tie to tie it off. That secures all of the wires and I am going to go back and trim off any extra pieces from the zip-ties. That completes the installation of our new Tow Ready T-One connector part number 118303.

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Customer Reviews

T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector - 118303

Average Customer Rating:  5.0 out of 5 stars   (29 Customer Reviews)

Quickly and easily install a 4-way trailer connector on your vehicle with this custom wiring harness. T-One connector plugs directly into existing wiring - no cutting, splicing or tapping required. Powered ModuLite reduces strain on wiring system.

- 118303

by: Christopher J.06/04/2012

I was having trouble with an after-market trailer kit and needed to fix the situation fast. I looked up trailer light kits and found the video for replacing a light system for a 2005 Pacifica on eTrailer. I ordered the kit on Wednesday afternoon and it arrived on Friday afternoon. Installation could not have been more straight forward, and everything worked perfect. For my money this was a no-brainer. Thanks eTrailer. I know where to send people for their trailer and other automotive needs! 42654

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by: Bill Cook07/22/2011

Customer service was excellent - I had mistyped my address - somehow one letter was duplicated - it took a great deal of attention to detail to discover - On reviewing the order I noticed the mistake and called the next morning and the mistake was already corrected. Video instructions were also provided by WEB. With the video resources we all have today it should have been the standards 5 years ago - I applaud etrailer for the foresight to set the standard. 19873

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by: Glenn J.03/08/2014

The T-one Wiring Harness 4 pole Flat Trailer connector-118303 for the 2004 Pacifica worked perfectly, Instructions were easy to follow for a Novice wire installer like me. everything fit like a factory install. I recommend etrailer products Hands down if you want to install towing hitch and wiring for your trailer. Good job etrailer. 119914

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by: Rob R12/21/2011

So far great. Installed within 20 mins. Easy. The videos your web site had showing the install were great. Just as shown. There are cheaper general one size fit all products out there, but this was well worth the extra money for the exact product. Will try it out in a few days when I go getthe boat. Thanks for the great service. 28479

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by: Tim05/29/2012

Great product. Great price. Installed exactly like the the video. The wires were plenty long unlike other brands out there. Installation was easy. Took about an hour to install harness. I recommend this to anyone at anytime. No cutting splicing. Everything just plugged right together. Great product!!! 41936

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by: Charlie L.08/04/2012

The product installed exactly as the video showed. The video was of my exact model year, and was what drew me to purchase from etrialer in the first place. Instructions came with the product, but were of no need as the video walked me through each step. Excellent product, excellent video. 50552

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by: Diego R10/29/2012

Wire harness was a breeze to install. Instruction were the real deal!! 58358

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by: Dave H.09/11/2014

Replaced the cobjob, non-working U-Haul wiring install with this DIY kit made specifically for my vehicle. Great YouTube assembly instructions and very good printed directions. Only thing missing was a step for connecting the ground wire somewhere. Works great! 150698

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by: Jim W.02/08/2012

Product very Easy to install. Installation videos are great help. I also purchased the Tow Hitch. Wonderful product also. I am pulling a Trailer with DJ and Karaoke Equipment. I did not take any pictures, Sorry! 31326

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by: Lou05/31/2015

I cannot tell you how great your product was. The wiring harness was easy to install. the directions were excellent and following the online video was even better 199283

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by: andrew07/11/2011

Worked great, simple to install, very happy about having the inline fuse with this setup. Watch the video that they have up will save you a lot of frustration. 19160

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by: Bob C.07/16/2014

Have purchased several Items from and haven;t had any problems with any of it. All the products have worked great and as expected. 141719

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by: Glen C.07/24/2011

Again, the video on the web site was instrumental. The only hard part was getting the power connector out from behind the grommet. 20141

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by: Brandon04/23/2011

This thing was hooked up and ready to go in 5 minutes it was easy to intall and the video on this website was so helpful and easy to understand. 12266

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by: Joe Z11/22/2013

Everything installed just as the video said it would, no splicing with this kit. It was worth the money. Very Happy with the part and install. 108206

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by: joeg02/06/2012

harness worked exactly as specified - the online video on the trailer website was very helpful - showed exactly how do to the insall 31187

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by: Anthony B.05/25/2015

It couldn't have fit any better. The directions that came with it along with the video provided on the website were perfect. 196583

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by: L.H. Thomaz08/05/2011

I had never changed a lamp on my car, yet by following the video instructions I did the job and everything works very well. 21212

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by: Sheryl C08/14/2014

Incredibly easy to install. Thanks for the online video too! We wouldn't have found this product with out it. Thank you! 146724

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by: Dennis E.02/20/2015

Excellent product, easy to install. This wiring harness protects the integrity of your factory vehicle wiring. 175440

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by: David06/18/2012

Helpful staff, on-time delivery. I will continue to order all my trailer parts from e-trailer. 44709

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by: Anna & Phil G06/05/2015

product is excellent - only wish is that there would be more pull wires. 200962

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by: JonDill08/06/2013

Soooo simple! We had it wired and working in less then 15 mins! 93619

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by: cantoinebrown05/06/2012

very easy instal watched video once done in twenty minutes 39561

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by: Scott VH06/25/2012

The trailer light kit was easy to install and works great 45559

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by: Todd S.05/11/2012

The wiring made it very easy to hook up my trailer. 40160

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by: Terry Thormeyer06/08/2013

Very simple to install. Only took 1 hou r. 83837

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by: Brad M07/21/2015

Great product and instruction video. 213275

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by: Thomas C05/01/2011

Very easy to install 12649


Ask the Experts about this Tow Ready Custom Fit Vehicle Wiring
Do you have a question about this Custom Fit Vehicle Wiring?

  • Installing 7 Way Connector 32145 on a 2005 Chrysler Pacifica
  • If you have the factory tow package, installation of part # 42145 is very easy. There will be a connector on a wiring harness that will fit this part, it will be tucked up, maybe taped, somewhere close to the rear bumper. You will then attach the mounting bracket in a convenient location near the hitch, and it will hold the 7 way plug. If you do not have the factory tow package, you will need to connect a T-One harness inline with the tail lights using part # 118303. We have videos for...
    view full answer...

  • Items Needed to Install Brake Controller on 2005 Chrysler Pacifica
  • Because the 2005 Pacifica is not pre-wired for a brake controller, the controller would need to be hard wired using a Brake Controller Install Kit # ETBC7. There is not a wiring adapter available. Although the install kit contains everything needed to install the brake controller, the vehicle will need a functional 4-pole trailer connector, part # 118303 if it does not already have one. The adapter included in the kit will convert the 4-pole to a 7-way trailer connector. Once the...
    view full answer...

  • Trailer Hitch, Ball Mount, Ball, and Trailer Wiring Recommendations for a 2004 Chrysler Pacifica
  • In order to pull a trailer with your 2004 Chrysler Pacifica, you will need a trailer hitch, a ball mount, ball, pin and clip, and trailer wiring. For a trailer hitch, you can use the Draw-Tite hitch, # 75522, that you have referenced. I have included a link to the installation instructions and a link to a video showing a typical installation for you. For a ball mount, ball, and pin and clip, I recommend the etrailer ball mount kit, # 989900. This kit comes with 2 ball mounts, a 2 inch...
    view full answer...

  • Is a 20 Amp Fuse Included with T-One Vehicle Wiring Harness for a 2006 Chrysler Pacifica
  • For the 2006 Chrysler Pacifica, the 20 amp fuse required for installation of the T-One Vehicle Wiring Harness, # 118303, is included with the harness. I have included a link to the installation details and a link to a video showing a typical installation of this wiring harness.
    view full answer...

  • Left Side Trailer Lights Not Working with Tow Ready Wiring Harness for a 2007 Chrysler Pacifica
  • The fact that it is on the left side only and happens on all the trailers you have tried indicates that there is an issue on the vehicle side wiring and possibly inside the converter box itself. To test it, have someone sit in the vehicle to run through the various functions (turn signals, running lights, and brake lights) while you test the wiring with a circuit tester, # 3808. Start by testing the wiring going into the converter from the vehicle. If you do not get the correct signal...
    view full answer...

  • Installing TowReady T-One Vehicle Wiring Harness # 118303 in 2005 Chrysler Pacifica
  • The 4-pole trailer wiring harness you referenced, TowReady T-One Vehicle Wiring Harness # 118303, is a correct fit for your 2005 Chrysler Pacifica. This plug-in harness requires no cutting or splicing of wires since it uses T-connectors that plug in inline with the wiring to your Pacifica tail lights. If there is a white wire with a ring terminal secured to the vehicle's metalwork behind the driver-side tail light this should remain in place. Often white wires with ring terminals are...
    view full answer...

  • Wiring Harness is Needed to tow a Boat Trailer with Surge Brakes with a 2005 Chrysler Pacifica
  • You will not need a brake controller to tow a boat trailer with surge brakes. Surge brakes are actuated by an actuating coupler on the trailer, so all you will need is a trailer wiring harness for the lights and an electric lockout, if your actuating coupler has an electric lockout. You can tell if your actuating coupler has an electric lockout by looking at the trailer connector. If you have a 5-pin trailer connector, then you likely have an electric lockout on your coupler. If you have...
    view full answer...

  • Will Curt Trailer Hitch, # 13529 Fit a 2006 Chrysler Pacifica
  • I believe I know the bracket that you are referring to. Take a look at the installation video for Draw-Tite Trailer Hitch, # 75522 which I have linked for you. In the video, our installer actually uses one of the bolt holes used by the bracket to install the hitch. The mounting brackets on this hitch and Curt Hitch, # 13529, to fit around the contours of the bracket. The exhaust hanger should not be an issue. If you plan on doing some towing, I recommend the etrailer Ball Mount Kit,...
    view full answer...

  • 2005 Chrysler Pacifica Wiring Harness Warranty
  • I am sorry you are having a problem with your wiring harness, unfortunately there is only a one year limited warranty on the T-One Wiring Harness. There is no subset of this product and 118303 is the only harness available for the 2005 Chrysler Pacifica. You may want to purchase the vehicle specific wire harness so that you do not risk overloading a circuit or causing a fire.
    view full answer...

  • Trailer Wiring Harness Recommendation for a 2005 Chrysler Pacifica
  • For trailer wiring for your 2005 Chrysler Pacifica you would want the Tow Ready harness part # 118303. This will plug in line with the taillight harnesses of your vehicle. I attached an install video for you to check out as well. For a mounting bracket you would want the part # 18144.
    view full answer...

  • Torque Rating for Hidden Hitch Class III # 87432 for 2004 Chrysler Pacifica
  • We don't publish the torque ratings for the fasteners, because the hitch manufacturers can change them. If you look at the bottom of page 2 of the instructions (see provided link), you'll see the torque rating for both the 1/2 inch and the M12 fasteners. The links pull the instructions directly from the manufacturer's websites, so they're always current. I'll also link you to an install video for the hitch. If you'll be using the hitch for towing, you might also be interested in the...
    view full answer...

  • Where to Connect Ground Wire on Tow Ready Wiring Harness # 118303 on 2006 Chrysler Pacifica
  • The white wire coming out of the converter on the Tow Ready wiring harness part # 118303 is a ground wire. The ground wire on the harness can be connected to almost any metal surface that is electrically grounded. Make sure what ever point you are wanting to use is free and clear of paint so there is direct metal to metal contact. The best place would be the frame. If the frame isn't an option for the ground the next best place is where two pieces of metal overlap each other or where the...
    view full answer...

  • Trailer Wiring Connector # 118303 for 2005 Chrysler Pacifica Shows Constant Power on Running Lights
  • There should not be any major constant power draw on any of the circuits on wiring harness # 118303. Though there may be some residual power coming through. There may be a short or ground issue that is causing some power to trickle through. Check the vehicle side connector for any dirt or corrosion and clean it out. Do the same for the connector on # CR-600LED.
    view full answer...

  • Trailer Wire Connection Locations for a 2005 Chrysler Pacifica
  • It sounds like you are looking for the power wire connection point for the T-One Wiring Harness, # 118303, on your 2005 Chrysler Pacifica. We have a video detailing this installation on the 2005 model and you can see the power wire location behind the taillight and then a grommet on the driver side at 48 seconds into the video.
    view full answer...

  • Fuse Location for Trailer Wiring Harness # 118303 on 2004 Chrysler Pacifica
  • When installing the Tow Ready T-One Wiring Harness, # 118303, on your 2004 Chrysler Pacifica, you will need to access the fuse box under the hood on the driver side near the front of the vehicle. Next, you will insert the 20 amp fuse into position number 10 labeled Trailer Tow/Spare B3-5 (see photo). I have attached a link to the installation instructions that contains this information.
    view full answer...

  • Is There a Difference Between the Hitch Receivers Offered for the 2007 Chrysler Pacifica 4.0
  • The three hitch receivers offered for the 2007 Chrysler Pacifica, Hidden Hitch # 87432, Curt # 13529, and Draw-Tite # 75522, are basically identical, have the same towing capacities, and will install in the same way. There really is no way to get around lowering the exhaust and removing your spare tire may ease the installation process so it is highly recommended. Some say that Curt hitches have a better powder coating but for the most part, price is going to be the main difference....
    view full answer...

  • How to Test the Module of a Trailer Wiring Harness
  • What you will want to do is test the wires going into the box of the converter box for voltage with a circuit tester like the # 3808 to see if there is voltage going into the box when the taillight functions of your vehicle are applied, and then test the output side of the box to see if the current is making it through the converter. If not then the problem is that the converter box has shorted itself out and would need to be replaced. Before you replace it you will want to inspect the...
    view full answer...

  • Wiring a 1998 Mitsubishi Montero Sport
  • For your 1998 Mitsubishi Montero the only wiring fit options that we list are hardwire options, and out manufacturers do not offer a plug and play installation available for your vehicle. The wiring options that we offer are # C56175, and # 119178KIT. Both of these harness will install the same way and you will have to use a circuit tester like # 3808 to indetify the correct wires you will need to splice into at the rear of your Montero. The T-one wiring harness # 118303 that you...
    view full answer...

  • Will Hidden Hitch Trailer Hitch 87432 Fit a 2004 Chrysler Pacifica with Full Size Spare Tire
  • I spoke with my contact at Hidden Hitch about hitch # 87432. He stated that the full-size spare tire on the vehicle will not be a problem. It will be easier to install the hitch if you remove the spare but after the hitch is installed the tire will go back into place. If you plan on doing some towing I also recommend etrailer ball mount kit # 989900. It comes with 2 ball mounts, 2 balls, a hitch pin with clip, and a storage bag. For trailer wiring if needed use # 118303. I have included...
    view full answer...

Do you have a question about this Custom Fit Vehicle Wiring?

Info for this part was:

Photos by:
Theodore B

Video Edited:
Andrew K

Expert Research:
Robert G

Expert Research:
Michael H

Expert Research:
Reno H

Expert Research:
Jameson C

Video Edited:
Joshua S

Test Fit:
Nicholas E

Expert Research:
John H

Expert Research:
Adam R

Updated by:
Laura H

Photos by:
Sam P

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