bing tracking image
  1. Tow Bar Wiring
  2. Lexus
  3. RX 330
  4. 2004
  5. Roadmaster
FITS 2004 Lexus RX 330
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
Our Price: $89.39
Tow Bar Wiring
Confirmed to Fit
2004 Lexus RX 330

Will this fit?

To see if this custom-fit item will work for you please tell us what vehicle you'll use it with.

Add to cart
In Stock
zoom in icon
slider vertical icon
zoom out icon
Comment field cannot be left empty.
Name field cannot be left empty.

Thank you! Your comment has been submitted successfully. You should be able to view your question/comment here within a few days.

Error submitting comment. Please try again momentarily.

Product Images

In Use/Installed

Customer Photos

Need help with installation?
Locate installers near me
Call etrailer.com at 1-800-940-8924 for expert service. We are your Lexus tow bar wiring experts, and offer a great price. etrailer.com carries a complete line of Roadmaster products for your Lexus RX 330 2004. Roadmaster 4-Diode Universal Wiring Kit for Towed Vehicles - 4-Way Flat Connectors part RM-154 from Roadmaster can be ordered online at etrailer.com. Complete tow bar wiring installation instructions and technical support.
  • All Info
  • Reviews (771)
  • Q & A (0)
  • Photos

2004 Lexus RX 330 - 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   (771 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:

    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:

    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:

    Great tow plate , easy to install



    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:

    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:
    Toyota Land Cruiser

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



    by:

    Easy install



    by:
    Jeep

    Straightforward install on my Jeep Gladiator and no issues.



    by:

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



    by:

    The stuff not here


    25
    771
    Show More Reviews

    See what our Experts say about this Roadmaster Tow Bar Wiring

    • Items To Flat Tow My 2021 Jeep Wrangler Unlimited Sport S
      Let's review your list. You selected the Roadmaster # RM-676 “Nighthawk” all terrain tow bar with LED lights. Included safety cables and rated for 8000 pounds flat tow. You can use the Nighthawk, however since your Jeep weighs about 5000 pounds you could use Roadmaster # RM-522 “Falcon” that has a 6000 pound tow rating. Basically, if you love the super-cool LED lights and find them to be a safety feature go with the Nighthawk, otherwise, save some money with the Falcon. If you choose...
      view full answer...
    • 2021 Grand Cherokee Overland Flat Towing Recommendations
      The Roadmaster Direct-Connect Base Plate Kit - Removable Arms Item # RM-521440-5 and any Roadmaster tow bar excluding the Tracker and StowMaster tow bars will be a great and easy setup choice. Personally I recommend the Roadmaster Falcon All Terrain, Non-Binding Tow Bar - Motorhome Mount - 2" Hitch - 6,000lbs Item # RM-522 because it has a 6,000lbs weight capacity so you load your Jeep up with extra cargo, is non-binding, and is a quick and easy hookup. We do offer installation and our...
      view full answer...
    • Flat Tow Recommendations For A 2015 Jeep Wrangler
      Base Plate: After looking up your Mopar bumper it showing up as just the standard fit with the chrome bar aesthetic so you shouldn't have any issues using the Roadmaster Direct-Connect Base Plate Kit - Removable Arms Item # RM-521448-5. Tow Bar: Roadmaster Falcon All Terrain, Non-Binding Tow Bar - Motorhome Mount - 2" Hitch - 6,000lbs Item # RM-522. Tow Bar Wiring: Roadmaster Universal Hy-Power Diode Wiring Kit Item # RM-154. Safety Cables: RoadMaster 68" Single Hook, Coiled Safety...
      view full answer...
    • Can you Flat Tow the 2020 Chevrolet Traverse
      According to the owner's manual for your 2020 Chevrolet Traverse, you are able to flat tow it. This is the reason the Blue Ox Base Plates, part # BX1734 and # BX1738, is compatible with your vehicle. If you're looking to flat-tow, you should know their are additional components needed. Your Blue Ox base plate is compatible with the Avail Tow Bar, part # BX7420. This has a weight rating of 10,000 pounds and has the safety chains included. You'll need wiring for your Traverse. I recommend...
      view full answer...
    • Parts Needed to Flat-Tow a 2022 Ram 1500 Limited
      In order to flat-tow a 2022 Ram 1500 Limited you'll need a base plate kit, tow bar, safety cables, toad vehicle wiring harness, and a supplemental braking system. I have attached a list of these parts for you below. Roadmaster Direct-Connect Base Plate Kit part # RM-522203-5 Roadmaster Nighthawk All Terrain, Non-Binding Tow Bar part # RM-676 Roadmaster Universal Hy-Power Diode Wiring Kit part # RM-154 Brake Buddy Select 3 Portable Supplemental Braking System part # HM39524
      view full answer...
    • Parts Needed to Flat Tow 2021 Jeep Cherokee Latitude
      The Roadmaster Direct Connect Base Plate kit part # RM-521452-5 is a confirmed fit for your 2021 Jeep Cherokee Latitude and is the easiest to use with the very easy to use Roadmaster Sterling # RM-576 which comes with safety chains and wiring. For lighting we have the # RM-154. The diode kit that comes with this allows you to splice into the taillight wiring so that your RV controls the vehicle taillights and does not require drilling into the taillight housings. This comes with a round...
      view full answer...
    • Flat-Tow Wiring for a 2006 Toyota Prius
      I do have an option for you but they do not make a "plug-in" kit for what you are looking for. In order to activate the lights in the toad while in your RV you will need to use a flat-tow diode kit like the Roadmaster Universal Hy-Power Diode Wiring Kit part # RM-154. This kit as you mentioned will tie into the vehicle's tail light circuits and send this signal to the RV. The diode's will be needed to prevent the backflow of electricity. Another option for you that would not require any...
      view full answer...
    • Can Roadmaster Diode Kit RM-154 be Used with Blue Ox Patriot Braking System
      The Roadmaster diode kit part # RM-154 is a tow bar lighting kit that can work on a vehicle that has a Blue Ox Patriot system part # BLU37TR but it does not control the Patriot system at all and would be totally independent of it.
      view full answer...
    • Parts Needed to Flat Tow 1999 Chevrolet Suburban
      Yes, you can flat tow your 1999 Chevrolet Suburban using the Roadmaster MX Base Plate Kit, part # 3101-1 with the RoadMaster Falcon All Terrain Tow Bar, part # RM-522. I have included installation instructions for these parts as well as an installation video of this tow bar installed on a Chevrolet Sonic. The vehicle is different but the installation will be similar. For lighting there are several options. If you will not be towing often then I recommend a magnetic kit like # RM-2120....
      view full answer...
    • 2021 Jeep Gladiator Flat Tow Wire Harness
      For tow bar wiring I suggest the Roadmaster Universal Hy-Power Diode Wiring Kit # RM-154. It works with combined or separate wire systems, prevents electrical feed back and keeps your vehicles safe from each other.
      view full answer...
    • Are There Demco Base Plates for a 2020 Ram 1500 Rebel
      I do have some great base plate options for a 2020 Ram 1500 but Demco does not offer an option for Rebel models. Instead, I recommend using the Roadmaster Direct-Connect Base Plate Kit part # RM-522205-5 which will work well with the Roadmaster Nighthawk All Terrain, Non-Binding Tow Bar part # RM-676. If you already have a Demco tow bar just get the Demco Tow Bar Adapter part # DM9523032. I have attached some other parts below as well but there isn't a kit. Demco SBS Air Force One Supplemental...
      view full answer...
    • Tow Bar for Blue Ox Base Plate BX1131 on 2011 Jeep Liberty Renegade
      According to Blue Ox, the Blue Ox Base Plate Kit # BX1131 is only compatible with motorhome-mounted tow bars, so it will not work with your BX4212 car-mounted tow bar. We do have tow bars which will work, and for that I recommend the etrailer SD Non-Binding Tow Bar for Blue Ox Base Plates # e47ZR. This is a great value for a tow bar that has long arms for maneuverability and also has safety chains so you don't have to purchase those separately. Along with Tow Bar # e47ZR and Blue Ox Base...
      view full answer...
    • Recommend A Roadmaster Base Plate Kit to Flat Tow 1999 Kia Sportage
      The base plate kit that will fit your 1999 Kia Sportage is the Roadmaster XL Base Plate Kit, part # 2104-1. In addition to a base plate kit, to finish your towing setup you need a tow bar, safety cables, vehicle wiring or portable lights, and a supplemental braking kit. For a tow bar, I recommend RoadMaster StowMaster Car-Mounted Tow Bar, part # RM-501, which features the Autowlok feature. Autowlok has telescoping arms that extend and lock when pulled on by tow vehicle for easy hooking...
      view full answer...
    • Complete Flat Towing Setup For A 2021 Ford Bronco
      Yes, the Blue Ox Base Plate Kit # BLU97XR you mentioned is intended to be used on the 2021 Ford Bronco's with the modular bumper. If you are interested in a complete flat towing setup, you'll also need: -A Tow Bar, like the Blue Ox Ascent # BX4370. -A Braking System, like the Brake Buddy Select 3 Portable Supplemental Braking System # HM39524. -A Wiring Kit, like The Roadmaster Hy-Power Diode Wiring Kit # RM-154. You'll want to measure the needed rise and drop before choosing a high-low...
      view full answer...
    • Parts Needed to Flat Tow a 2022 Jeep Wrangler with Factory Bumper
      You will need 5 main parts to flat tow your 2022 Jeep Wrangler with factory bumper. Those parts are a base plate kit, tow bar, safety chains, tow bar wiring and supplemental braking system. I have included a recommendation for each of those below and a brief description of their purpose. It is also important to note there may be additional parts needed depending on what the manufacturer recommends/requires. You should reference your Jeep's owners manual to ensure you are doing everything...
      view full answer...
    • Complete Flat Tow Set-Up For A 2015 Jeep Grand Cherokee Without Tow Hooks
      You are going to need quite a bit of things to successfully and safely flat tow your 2015 Jeep Grand Cherokee. First thing you're going to need a baseplate to be able to connect your tow bars to your towed vehicle. For a base plate kit, I recommend the Roadmaster Direct-Connect Base Plate Kit # RM-521440-5. This base plate works with the Roadmaster Sterling, Blackhawk, Blackhawk 2, Falcon, and Falcon 2 tow bars. Next, you're going to need a set of tow bars, I recommend the Roadmaster...
      view full answer...
    • 2019 Honda Fit Flat Towing Set-Up Recommendations
      I believe I have just the parts for you! For your 2019 Honda Fit, I recommend the Roadmaster Direct-Connect Base Plate Kit # RM-521571-5 for your base plate. This base plate is great because the drawbars are so easy to operate. Simply, insert them into the brackets and twist to lock them into place. To remove them, all you need to do is pull the built in pin to disengage the lock, then twist and pull. Since you mention you want one person to be able to handle hookup, this will do a great...
      view full answer...
      Image 1 for
    • Recommended Flat Towing Equipment to Use for a 2013 Mini Cooper
      Yes, the Blue Ox Base Plate Kit # BX1307 is a confirmed fit for your 2013 Mini Cooper and will work well with the Blue Ox Adventurer # BX7322. To properly tow your Mini Cooper behind your RV you will also need a safety cable set, tow bar vehicle wiring, and most states require the use of a supplemental braking system. Blue Ox has 2 of those products. The 7 foot Safety Cables, part # BX88196, is rated for 5,000 lbs which is what your tow bar is rated for. For a supplemental braking...
      view full answer...
    • How to Determine the Wiring Functions of a Vehicle to Install Diode Tow Bar Wiring Kit
      To install a diode tow bar wiring kit like the part # RM-154 you will have to use a circuit tester to test the wires that run to the vehicle taillights and then attach the diode wiring by function to them. I attached an install video that shows the process on a somewhat similar Honda for you to check out and get the idea how it's done.
      view full answer...
    • Do Fuses Have To Be Pulled When Flat-Towing 2010 Cadillac SRX Behind Motorhome
      Per the dinghy towing instructions in the owner's manual for your 2010 SRX, three fuses need to removed and then re-installed in a later step. The fuses are BCM 1, BCM 2, and BCM 3. This information can be found starting on page 9-106. There are other restrictions in the manual based on the transmission and engine size. I recommend checking the manual or with your dealership to make sure you have your SRX prepped for towing. There are five items you need when flat-towing a vehicle. You...
      view full answer...
    • Can Tow Bar Lighting Kit part # RM-154 be Installed on Tow Vehicle with Separate Turn Signals
      The great thing about the diode tow bar wiring kits like the part # RM-154 is that you can use them to install on a vehicle with separate taillight circuits and have them operate like combined without it being an issue. Basically what will happen is that what was normally just a stoplight on your vehicle can be wired to blink like a turn signal and illuminate as a stoplight circuit and the vehicle's original wiring won't make a difference. It's the easiest solution for your setup unless...
      view full answer...
    • Complete Flat Towing Setup for a 2015 Jeep Wrangler Unlimited
      Sure thing, I'd love to get you all set up and in your way! For your 2015 Jeep Wrangler Unlimited with a stock bumper, you're going to need to grab a set of wiring # RM-154, tow bars # RM-676, a braking system # HM39524, and a base plate kit RM-521448-5. I like the base plate # RM-521448-5 because of the removeable arms which helps maintain the "from the factory" look and it's custom to fit for your vehicle so there isn't any welding required. As for the tow bars # RM-676 mentioned,...
      view full answer...
    • Base Plate Adapters for 2020 Jeep Gladiator With ARB Bumper
      There are adapters which will attach to the D-ring bumper mounts on your 2020 Jeep Gladiator with an ARB bumper, though I was unable to find the exact size of the D-rings of your bumper. I recommend the Roadmaster option, and you simply need to take a couple quick measurements to determine the right adapter to flat tow with. Also keep in mind the mounting holes need to have a 7/8" or 1" diameter. - 3/4" Thick Shackle Mounts: Adapter for Jeep D-Ring Bumper Mounts - 3/4" Thick # RM-035 -...
      view full answer...
    • Parts Needed to Flat Tow a 2023 Chevrolet Silverado 2500
      I am not completely sure what you are trying to rewire. Vehicles and motorhomes do not use 24v for lights. Diesel motorhomes and trucks typically use 24v for the starter but only 12v for everything else. So wiring like the Roadmaster Universal Hy-Power Diode Wiring Kit # RM-154 will work just fine. If there is something particular you are not sure about, please let me know and I would be happy to address it. To flat tow, you will need at least 5 main parts. Those parts being a base plate...
      view full answer...


    < Previous
    123. . .49



    Do you have a question about this Tow Bar Wiring?


    Info for this part was:

    Employee Joe V
    Test Fit:
    Joe V
    Employee Nicholas E
    Test Fit:
    Nicholas E
    Employee Rick A
    Test Fit:
    Rick A
    Employee Shane T
    Test Fit:
    Shane T
    Employee Randy B
    Test Fit:
    Randy B
    Employee Jared G
    Test Fit:
    Jared G
    Employee Andrew S
    Test Fit:
    Andrew S
    Employee Brent H
    Test Fit:
    Brent H
    Employee Shane H
    Test Fit:
    Shane H
    Employee Robert C
    Test Fit:
    Robert C
    Employee Conner L
    Test Fit:
    Conner L
    Employee David F
    Test Fit:
    David F
    Employee Ryan G
    Test Fit:
    Ryan G
    Employee Clayton O
    Test Fit:
    Clayton O
    Employee Bradley B
    Test Fit:
    Bradley B
    Employee John A
    Test Fit:
    John A
    Employee Mike L
    Expert Research:
    Mike L
    Employee Sarah L
    Expert Research:
    Sarah L
    Employee Robert G
    Expert Research:
    Robert G
    Employee Patrick B
    Expert Research:
    Patrick B
    Employee Michael H
    Expert Research:
    Michael H
    Employee Jeff D
    Expert Research:
    Jeff D
    Employee Reno H
    Expert Research:
    Reno H
    Employee Jameson C
    Expert Research:
    Jameson C
    Employee John H
    Expert Research:
    John H
    Employee Adam R
    Expert Research:
    Adam R
    Employee Rachael H
    Expert Research:
    Rachael H
    Employee Jeffrey L
    Expert Research:
    Jeffrey L
    Employee Zack K
    Video Edited:
    Zack K
    Employee Joshua S
    Video Edited:
    Joshua S
    Employee Jacob T
    Video Edited:
    Jacob T
    Employee Andrew L
    Video Edited:
    Andrew L
    Employee Kathleen M
    Video Edited:
    Kathleen M
    Employee Mike H
    Video Edited:
    Mike H
    Employee Dustin K
    Video Edited:
    Dustin K
    Employee Sue W
    Video Edited:
    Sue W
    Employee Chris R
    Video Edited:
    Chris R
    Employee Jonathan Y
    Video Edited:
    Jonathan Y
    Employee John S
    Video Edited:
    John S
    Employee Andrew K
    Video by:
    Andrew K
    Employee Alan C
    Video by:
    Alan C
    Employee Zach D
    Video by:
    Zach D
    Employee Michael B
    Video by:
    Michael B
    Employee Jacob H
    Video by:
    Jacob H
    Employee Aidan B
    Video by:
    Aidan B
    Employee Thomas T
    Video by:
    Thomas T
    Employee Schuyler H
    Video by:
    Schuyler H
    Employee Ethan H
    Video by:
    Ethan H
    Employee Rick G
    Video by:
    Rick G
    Employee Lindsey S
    Updated by:
    Lindsey S
    Employee Wilson B
    Updated by:
    Wilson B
    Employee Hannah L
    Updated by:
    Hannah L
    Employee Amanda K
    Updated by:
    Amanda K
    Employee Cole B
    Installed by:
    Cole B

    At etrailer.com we provide the best information available about the products we sell. We take the quality of our information seriously so that you can get the right part the first time. Let us know if anything is missing or if you have any questions.