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  1. Tow Bar Wiring
  2. Toyota
  3. Corolla
  4. 2015
  5. Roadmaster
FITS 2015 Toyota Corolla
Roadmaster 4-Diode Universal Wiring Kit for Towed Vehicles - 4-Way Flat Connectors

Roadmaster 4-Diode Universal Wiring Kit for Towed Vehicles - 4-Way Flat Connectors

Item # RM-154
Retail:$138.23
Our Price: $93.86
You Save: 32%
Tow Bar Wiring
Confirmed to Fit
2015 Toyota Corolla

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The best technical support and full tow bar wiring installation instructions. Great price Corolla tow bar wiring and expert service. Toyota Corolla, 2015 tow bar wiring by Roadmaster are available from etrailer.com. For expert service call 1-800-940-8924 to order your Roadmaster 4-Diode Universal Wiring Kit for Towed Vehicles - 4-Way Flat Connectors part number RM-154, or order online at etrailer.com.
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2015 Toyota Corolla - Roadmaster 4-Diode Universal Wiring Kit for Towed Vehicles - 4-Way Flat Connectors

  • Diode Kit
  • Splices into Vehicle Wiring
  • Tail Light Mount
  • Universal
  • Roadmaster

This wiring kit carries your RV's brake and turn signals to your towed car's tail lights. Diodes prevent damage from electrical feedback. Connects RV and towed car with 4-pole flat plugs. Includes installation hardware.


Features:

  • Carries your RV's tail, brake, and turn signals to your towed car
  • Prevents feedback that can damage your vehicle's electrical components with diodes
  • Includes:
    • 4 Hy-Power diodes
    • (2) 4-Wire harnesses with 4-pole flat connectors
    • Butt connectors, 1 ring terminal, zip ties, and plastic loom


Specs:

  • Max amperage: 85 amps
  • Max voltage: 24 volts
  • Power cord: 6' long
  • 4-Wire harness: 30' long
  • Plastic loom: 3' long


Notes:

  • A brake light relay (RM-88400 - sold separately) may be required if used with a flat tow brake system. (See below.)
  • A wiring converter (118158 - sold separately) and 2 additional diodes will be needed to retain separate turn and brake signals. (See below.)


  • review for diode kit

    "Don't be intimidated by diodes: if you can strip and crimp wire, this installation will be no problem."


    Combined Lighting System vs Separate Lighting System

    Combined vs Seperate Lighting System

    A combined lighting system, or 2-wire system, uses the same light bulb to signal both braking and turning. (In other words, the car signals a turn by flashing the brake light.)


    A separate lighting system, or 3-wire system, has the brake signal and the turn signal light up independently of each other. Typically, the turn signal is amber.


    To keep the separate lighting system on your car functioning properly while you're flat towing, add a wiring converter (118158 - sold separately) and 2 additional diodes.


    Do I Need a Brake Light Relay?

    If the engine is off and your car's brake lights illuminate when you press the brake pedal, you need to install a brake light relay (RM-88400 - sold separately) with this kit. Without a relay, your car's brake signal will override the turn signal sent by the RV when you are slowing down to make a turn, creating a potentially dangerous situation. Other drivers will see that you're slowing down, but not that you're making a turn. With a brake light relay, you can signal both and travel safely.



    Wiring Diagrams for Roadmaster Diode Kit

    Diode Wiring Diagram

    Diode Wiring Diagram

    Diode Wiring Diagram

    Diode Wiring Diagram


    154 Road Master Universal Wiring Kit with 4 Hy-Power Diodes and 4 Wire Flat Trailer Connectors

    Compare to Tow Ready TR118821

    Installation Details RM-154 Installation instructions

    Customer Satisfaction Score:


    Customer Reviews

    Roadmaster 4-Diode Universal Wiring Kit for Towed Vehicles - 4-Way Flat Connectors - RM-154

    Average Customer Rating:  4.8 out of 5 stars   (777 Customer Reviews)

    This wiring kit carries your RV's brake and turn signals to your towed car's tail lights. Diodes prevent damage from electrical feedback. Connects RV and towed car with 4-pole flat plugs. Includes installation hardware.

    by:

    Simple to install kit that does exactly as listed. Very thorough instruction that were easy to follow.



    by:

    It does what it says on the tin. Easily lit up my XJ so I could tow it. Only regret is that by making the connections at the rear, you don’t get the front market lights on the toad. I should have connected the running lights diode in the harness under the dash so all the marker lights come on at night.



    by:

    I’m always extremely satisfied with Roadmaster products. I had just bought a new truck and planned on towing it so I needed everything to get it ready to tow. This review also applies to to the other items I purchased.



    by:

    First of all Justin B,was awesome so very helpful and knowledgeable went over everything with me and then double checked what was needed before I placed the order for my 2022 maverick to be flat towed, order only took 3days to get to Fl.Kudos to Justin B all the guys putting together the order
    and etrailer awesome job,will definitely use them again for any of my needs.



    by:

    I thought I order the 7 to 6 pin wiring harness for my vehicle as I have the 7/6 cord I used when I pulled my pickup. I also ordered the 6 pin mounting bracket with the 6 pin adapter that wires into the harness. I received the kit which is a flat 4 pin harness.



    by:
    2015 Subaru Forester

    etrailer is a great company for towing products. They have fast delivery and they have nice installation videos. This order I added 2 more diodes to wire my 2015 Subaru Forester to have separate wiring for break, running, and turn signal lights.



    by:

    Works perfectly and straightforward instructions made it easy to install.



    by:

    This system worked perfectly from experience. They help from trailers e trailer agents was crucial for guiding me through the process.



    by:
    2014 Chevrolet Equinox

    It is exactly as advertised, not yet installed but looks pretty self explanatory



    by:

    THE EQUIPMENT IS FINE. THE INSTALLATION VIDEOS ARE SUPERB. MAKING PURCHASING THIS PRODUCT VERY WORTHWHILE.



    by:

    the service was great, they went out of their way to make sure they were providing me with the correct part



    by:

    I have order several things from etrailer. Their products are great. Due to nobody's fault but my own I ordered some wrong things. The return was so easy, no questions asked. I would recommend this company to anybody.



    by:
    2017 Jeep Grand Cherokee

    I’ve used several of these and they always work great.
    etrailer videos are a great help!



    by:

    Excellent help when ordering and follow through when order received. Can’t beat their customer service and sit!!



    by:

    Items arrived right on schedule and in good order. I ordered three items in the last few weeks. Their CHAT agents were extremely helpful in answering all my questions about compatibility with my vehicle.

    Kenneth

    12/8/2023

    Diodes were not the ones I needed even though the etrailer site said they were. I had to purchase the correct ones from the auto electric shop where I had the wiring done.

    Etrailer Expert

    Jenny N.

    12/8/2023

    @Kenneth Honestly, I am surprised that the diodes did not work for you. I am curious as to if the installer explained why they would not work for you. What the reason was?


    by:

    My parts arrived intact and in a timely manner. I am very pleased with my purchase.



    by:

    Installation instructions were great, no issues or questions. I ran the wire thru the frame, and used split wire loom and tape to protect wiring when outside the tube frame.



    by:

    Great tow plate , easy to install



    by:

    Good instructions and easy to install.



    by:

    Fits and works just as it should.



    by:
    2019 Chevrolet Blazer

    Product is very well built and is hidden within the bumper/grille. Installation wasn't too difficult, reinstallation of front bumper requires 2 people.
    Pleased with end results.



    by:

    The install was more challenging than the tow bar itself but we got it done. Be patient with the tail light diodes they are tricky to fit but not impossible. I ended up using some 3m double sided adhesive sticky’s to hold the diodes in place while i pushed the tail light assembly back into position.



    by:
    2015 Jeep Wrangler

    Lori was spot on in making sure I got the correct base plate assembly and light package for my 2015 Jeep Wrangler Sport. Deliver was within the projected timeframe and installation when as per detailed instructions . Good job Team ETrailer, that is why I keep coming back



    by:

    We tow a 2022 Ford Escape behind our Winnebago motorhome. This wiring kit did the job for us. Everything working great!



    by:
    Toyota Land Cruiser

    I used this on a 1988 Toyota Land Cruiser, so I could flat tow it behind an Motorhome. Easy to install!


    25
    777
    Show More Reviews

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