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Hopkins Plug-In Simple Vehicle Wiring Harness with 4-Pole Flat Trailer Connector

Hopkins Plug-In Simple Vehicle Wiring Harness with 4-Pole Flat Trailer Connector

Item # 40215
Our Price: $37.08
Custom Fit Vehicle Wiring

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Shipping Weight: 0.66 lbs
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Hopkins Custom Fit Vehicle Wiring - 40215
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Quickly and easily install a 4-way trailer connector on your vehicle with this custom harness. T-connector plugs directly into existing wiring - no cutting or splicing required. 1-800-940-8924 to order Hopkins custom fit vehicle wiring part number 40215 or order online at Free expert support on all Hopkins products. Great prices and Fastest Shipping for Hopkins Plug-In Simple Vehicle Wiring Harness with 4-Pole Flat Trailer Connector. Custom Fit Vehicle Wiring reviews from real customers.
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  • Reviews (47)
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Hopkins Custom Fit Vehicle Wiring - 40215

  • Custom Fit
  • Trailer Hitch Wiring
  • 4 Flat
  • Powered Converter
  • Hopkins

Quickly and easily install a 4-way trailer connector on your vehicle with this custom harness. T-connector plugs directly into existing wiring - no cutting or splicing required.


  • Provides a 4-way flat trailer connector at the back of your vehicle 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
    • Locate connection point behind rear bumper
    • Plug in connector
  • Includes a tail light converter to ensure that your vehicle's wiring matches that of your trailer
  • Protective connection terminals resist corrosion
  • Comes with dust cap for 4-way flat connector, cable ties, and terminal grease packet for electrical connections


  • Maximum amperage:
    • Stop/turn lights: 2.1 amps per circuit
  • 90-Day limited warranty


This custom-fit T-connector plugs into your vehicle's wiring harness, which is located behind your rear bumper on the driver's side.

Once installation is complete, the 4-way connector will be stowed beneath your vehicle, 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.

Tail Light Converter

A tail light converter is built into this T-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 vehicle's three-wire system need to be combined so they are compatible with the wiring system of the trailer. This converter combines 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 vehicle operate.

40215 Plug-in Simple Hopkins T-Connector with 4-Pole Trailer Connector

Installation Details 40215 Installation instructions

This Product Fits The Following Vehicles

California residents: click here

Customer Satisfaction Score:

Customer Reviews

Hopkins Plug-In Simple Vehicle Wiring Harness with 4-Pole Flat Trailer Connector - 40215

Average Customer Rating:  4.7 out of 5 stars   (47 Customer Reviews)

Quickly and easily install a 4-way trailer connector on your vehicle with this custom harness. T-connector plugs directly into existing wiring - no cutting or splicing required.


Arrived here in less that two days. Looks easy to install when weather gets better.

1997 Ford Ranger

I rarely get trailer wiring to work correctly because I'm not the best at wiring very happy to just plug it in and everything works thanks much!



Like a charm exactly what I needed only took a minute to install and no parts shop in my area could compete with the price 10 out of 10 would buy from you again

Chevrolet Orlando

Product worked as advertised; plug n' play. Have used it several times by now with no issues. Only thing I would like to point is that I paid extra for 3-day delivery on Sunday night about 1:00am and the item was delivered Thursday afternoon. Item was shipped Monday according to confirmation e-mail. I live in Orlando, FL

Etrailer Expert

Patrick B.


Per UPS terms, the pickup day is not counted as a transit day. Monday we packed and shipped the item so it was the UPS pickup date. Tue-Thurs are the 3 transit days that constitute the 3-Day delivery by UPS terms.


easy to install great fit

1999 Ford Ranger

We received the product a day earlier than expected, which was great. It was exactly as described on the web site and fit the wiring harness on the Ford Ranger. The instructions for attaching the trailer wiring harness were excellent and easy to follow. I highly recommend using for your trailer parts and accessories.


Excellent technology for auto owners. Greatly exceeds the process of trimming and tapping. The plug-in wiring harness was easy and quick to install.

1998 Ford Ranger

It took longer to get my tools out than it did to install this harness! Plugging it into existing connectors beats wires and clips every time!!

1995 Ford Ranger

The product came 2 days after the original date showing on the tracking information. Not a major problem other then that the product works great!!!! I will definitely order from etrailer.

1995 Ford Ranger

This item fit my 1995 Ford Ranger without any problems. Installation time approx.
20 min. as the saying goes "plug & play". Delivery took longer than expected but arrived in 7 days. Great quality and well made.


Good product. Best way for an easy trailer lighting.


what a lifesaver just unplug factory harness & plug in new harness and you are done


Haven't had a thought as about it. That means it's perfect, no worries. Honestly haven't hooked up a trailer much.


Great plug and play adapter. No problems at all


Adapter arrived quickly and the tracking function was great. Plugged right in and seems to function as advertised.


The easiest wiring I have ever done on a vehicle.


Exactly the right part. None of my local auto parts stores had this. Got to me in 3 days and worked perfectly right away.

1996 Ford Ranger

Plug and play, no problem with install , fit as expected. Highly recommend this!


Your product did not work. Junk.


Everything fit perfect, made my job a lot quicker

Carlton H.




Kenneth B.


works great no problems at all

1993 Ford Ranger

Worked perfectly - old set had been flattened and the new set went in like a dream. They included the grease which made things work quickly.


The item did not work. I did not get to install it until a few months later.

1996 Ford Ranger

Easy install and hasn’t givin me any problems at all.


Delivered as promised. Would recommend.


hooked up easy,and shipping was very fa st

Show More Reviews

See what our Experts say about this Hopkins Custom Fit Vehicle Wiring

  • Trailer Wiring Harness for a 1995 Ford Ranger
    The Hopkins trailer wiring harness # 40215 is a fit for your 1995 Ford Ranger and it does have a converter. It is smaller and looks different than other converters. I have pointed it out in the picture I have included for you. There are no additional wiring connections (other than the white ground wire) that you will need to make if you choose this harness.
    view full answer...
    Image 1 for
  • Why Does Hopkins Trailer Wiring Harness for 1997 Ford Ranger have Separate Ground Wire
    Yes, the advantage is that you will get a better ground connection with an independent ground wire on a trailer wiring harness such as # 40215 for your 1997 Ford Ranger. Some converter boxes require a separate ground wire because the factory ground for the vehicle tail lights is not sufficient for the converter's needs.
    view full answer...
  • Trailer Wiring Harness Recommendation for 1994 Ford Ranger
    For a trailer wiring harness confirmed as a fit for your 1994 Ford Ranger the Hopkins kit part # 40215 is a confirmed fit that will work great.
    view full answer...
  • What is Function of Red Wire on Hopkins Trailer Wiring Kit 40215
    The red wire on the input side of the converter box of the Hopkins wiring kit part # 40215 is the stoplight circuit. The converter box takes the wiring setup on your vehicle which has the stoplights and turn signals on different wires and combines them to be on the same circuit which is why the red wire does not come out the other side of the box.
    view full answer...
  • 4-Way Trailer Wiring Recommendation for 1993 Ford E-350 Van
    For your 1993 Ford E350 Van the only style of trailer wiring we have is the kind that installs inline with the vehicle taillights like the T-One kit part # 118343. With this kit you'd unplug your vehicle taillight connectors and plug this kit inline and you'd be set.
    view full answer...
  • Using Trailer Lights on a 1997 Ford Ranger with Separate Turn Signals and Brake Lights
    The 1997 Ford Ranger has separate turn signals and brake lights. Trailer lights have combined brake lights and turn signals. What you will need to do is use trailer wiring harness # 118325 which plugs into the factory tail light connectors on the truck (or if those are gone you can cut off the end that plugs into the vehicle and hard wire it in). If you have to cut off the end that plugs into the vehicle tail light connectors then hardwire it as follows: brown connects to vehicle running...
    view full answer...
  • Differences in Tow Ready and Hopkins Wiring Harnesses for Mazda B Series Pickup
    The main difference between the Tow Ready # 118325 and the Hopkins # 40215 wiring harnesses is that the Hopkins # 40215 requires the harness to be grounded to the vehicle with the included self-tapping screw. The wiring harness needs to be grounded at a location where the sheet metal is doubled. I recommend the Tow Ready T-One Vehicle Wiring Harness # 118325. This harness will have a much simpler installation since there it is a true plug-and-play wiring harness. Since the ground wire...
    view full answer...
  • Recommended 4-Way Wiring Harness for 2000 Ford Ranger STX
    The Hopkins 40215 kit is designed to be a fit for a 2000 Ford Ranger STX model. After talking with one of my contacts at a supplier, they told me that there were different connectors installed in Rangers for a brief period of time. That may be why the mismatch in the connectors as you spoke of. I am attaching a photo of the # 40215 connector we have. We pulled one from the warehouse to see how the pins were located. It sure appears that the connector would not match the OEM harness you...
    view full answer...
    Image 1 for
  • Troubleshooting Trailer Lights Not Working When Connected To 1994 Ford Ranger That Work With F-150
    Because your Ranger has tested good and yet your trailer does not work correctly when connected, there is a really good chance that it is a ground issue. This could be on the vehicle side, but is more likely to be on the trailer side. A faulty trailer ground could still work with a vehicle that puts more power into the trailer, so your friend's F-150 working doesn't mean that ground couldn't be faulty. I recommend checking that ground for rust and or corrosion and cleaning it up. You...
    view full answer...
  • Installing T-Connector Trailer Wiring Harness On 1993 Ford Ranger
    On the driver side frame rail you should be able to find the connection point that you install the Tow Ready Custom Fit Vehicle Wiring, part # 118325 to. Per the instructions you will need to use caution when separating the connector to avoid damaging the locking tabs on the connector. If you can gently pry the locking tabs up, you should be able to separate the connector with out much of a problem. You then install the T-connector to complete the installation.
    view full answer...
  • Will Aftermarket 4-Way Wiring Cause ECM Failure on a 1997 Ford Ranger
    We have found the Tekonsha wiring products, like the T-One # 118325 for your 1997 Ford Ranger, to be the most reliable out of all of the wiring options we carry. With that being said if 2 different local shops are thinking that your ECM is the issue then that would not be the result of the Hopkins Wiring # 40215 (or any other wiring for that matter) and you would need to get that checked out for the T-One to operate properly.
    view full answer...
  • Correct Trailer Wiring Harness for 2000 Ford Ranger
    According to my Hopkins Trailer Wiring Representative, the # 40215 wiring harness you mentioned fits 1993-1999 Rangers, but not the 2000 model. This explains why it's not working correctly. For your 2000 Ranger, I'd suggest the Tow Ready # 118344 which is a confirmed fit for your truck.
    view full answer...
  • Trailer Wiring Solution for 1996 Ford Ranger with Separate Turn Signs from Stop Lights
    The trailer wiring kits we offer for your 1996 Ford Ranger like the Hopkins part # 40215 were designed for the type of taillights that your truck has where the turn signals are separate from the stop lights. This kit combines the circuits onto the same wire which matches what trailer wiring has.
    view full answer...
  • Recommended Trailer Wiring on 1994 Ford Ranger Pickup
    To install the Hopkins 4-Way Flat Trailer Wiring Kit - Vehicle and Trailer Ends # HM48205 you will want to check for functions. Color matching doesn't always work, so I recommend using a circuit tester like # PTW2993 to test each function. I've attached an article to assist. If you choose not to hardwire your system, I recommend the Hopkins Plug-In Simple Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 40215 which is a fit for 1993 to 1997 Ford Rangers. This harness does...
    view full answer...
  • Is There a Universal 4-Flat Trailer Wiring Harness That Connects to Tail Lights
    There are universal hardwire options for a 4-flat wiring harness that connects to your tail lights. I'm not sure if you were asking for the vehicle side or trailer side so I'll go ahead and give options for both: - Vehicle Side: Curt Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # C58044 - Trailer Side: Wesbar 4-Pole Flat Connector - 4' Long # W787264 or 8' Long # W787268
    view full answer...
  • Wiring Harness for 1994 Ford Ranger
    I can't tell you specifically how a wiring harness you purchased from a competitor will install. The harnesses we offer for a 1994 Ford Ranger, the T-One Vehicle Wiring Harness # 118325, Curt T-Connector # C55325 and Hopkins Plug-In Simple Vehicle Wiring Harness # 40215 are all extraordinarily easy plug-in connectors. What I can offer you are general guidelines on how to splice in a 4-flat. What you will need in order to do this are the Cordless Circuit Tester # PTW2979 as well as at least...
    view full answer...

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

Info for this part was:

Employee Mike L
Expert Research:
Mike L
Employee Michael H
Expert Research:
Michael H
Employee Jameson C
Expert Research:
Jameson C
Employee Jeffrey L
Expert Research:
Jeffrey L
Employee Wilson B
Updated by:
Wilson B
Employee Alexander C
Updated by:
Alexander C
Employee Michael B
Installed by:
Michael B

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