Roadmaster 4-Diode Universal Wiring Kit for Towed Vehicles - 4-Pole Flat Connectors
Item # RM-154
Our Price: $91.09
Confirmed to Fit
2015 Ford Focus
Hatchback - Automatic transmission
Hatchback - Manual transmission
Sedan - Automatic transmission
Sedan - Manual transmission
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2015 Ford Focus - Roadmaster 4-Diode Universal Wiring Kit for Towed Vehicles - 4-Pole 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 electrical feedback. Towed car's tail lights will operate as a combined lighting system. 4-Pole wiring harness included.
Features:
- Carries your RV's tail, brake, and turn signals to your towed car
- Wires towed car as combined lighting system
- 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
- Wire connectors, zip ties, and plastic loom
- 1 Ring terminal
Specs:
- Max amperage: 85 amps
- Max voltage: 24 volts
- Power cord: 6' long
- 4-Wire harness: 30' long
- Plastic loom: 3' long
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Notes:
"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
A combined lighting 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 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 your towed car's brake lights illuminate when you press the brake pedal with the engine off, 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
154 Roadmaster Universal Wiring Kit with 4 Hy-Power Diodes
Compare to Tow Ready TR118821
Installation Details
Customer Satisfaction Score:
92% were satisfied with this product
8% of customers were not satisfied
- Wrong item was ordered
- Product did not meet expectations
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Customer Reviews
Roadmaster 4-Diode Universal Wiring Kit for Towed Vehicles - 4-Pole Flat Connectors - RM-154
Average Customer Rating: 4.8 out of 5 stars (770 Customer Reviews)
This wiring kit carries your RV's brake and turn signals to your towed car's tail lights. Diodes prevent electrical feedback. Towed car's tail lights will operate as a combined lighting system. 4-Pole wiring harness included.by: Benjamin 05/09/2024
Simple to install kit that does exactly as listed. Very thorough instruction that were easy to follow.
by: Wes 02/10/2024
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: Larry02/10/2024
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: Gregory H04/19/2024
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: Billy02/08/2024
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: Gerald12/29/2023
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: Chuck B04/15/2024
Works perfectly and straightforward instructions made it easy to install.
by: Luis02/28/2024
This system worked perfectly from experience. They help from trailers e trailer agents was crucial for guiding me through the process.
by: David04/18/2024
2014 Chevrolet Equinox
It is exactly as advertised, not yet installed but looks pretty self explanatory
by: Howard 03/09/2024
THE EQUIPMENT IS FINE. THE INSTALLATION VIDEOS ARE SUPERB. MAKING PURCHASING THIS PRODUCT VERY WORTHWHILE.
by: Penny02/14/2024
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: Dennis01/27/2024
2017 Jeep Grand Cherokee
I’ve used several of these and they always work great.
etrailer videos are a great help!
by: Randy 05/14/2024
My parts arrived intact and in a timely manner. I am very pleased with my purchase.
by: Kenneth 12/07/2022
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.
by: Gerald11/12/2023
Great tow plate , easy to install
by: Keith 04/05/2024
Fits and works just as it should.
by: Steve03/13/2022
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: Richard07/25/2022
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: Doug 08/11/2023
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: Darrin03/03/2024
Easy install
by: Steven 08/21/2023
Jeep
Straightforward install on my Jeep Gladiator and no issues.
by: Frank03/27/2022
Jeep
This was my choice for my flat tow set up on a 2018 Jeep GC. I did this install myself. it was not difficult.
Frank
4/9/2023
One year in and the wiring set up has worked as planned. no issues.
by: Dean 05/17/2023
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: Billy 06/03/2023
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: Woodruff03/28/2024
The stuff not here
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See what our Experts say about this Roadmaster Tow Bar Wiring
- Does 2006 Honda Odyssey Need to Disconnect Battery When Being Flat Towed?Your 2006 Honda Odyssey does not need to have its battery disconnected to be flat towed, though you will need either a wiring kit such as # RM-154 to power its brake lights and turn signals. Or, you could simply use Magnetic Tow Lights # TL21RK to give you these lights, but regardless of your choice your battery does not need to be disconnected.
view full answer... - Parts Needed to Flat Tow a 1983 Jeep CJ-8 D Scrambler Behind a Motor HomeActually, yes, the recommendation will be the same for the 1983 CJ-8 Scrambler as it is in the question and answer that you referenced. In order to flat tow a vehicle you will need to install base plates first so the tow bar has something to attach to. For a 1983 Jeep CJ-8 Scrambler, you will need to use Demco base plates, # DM9518112. These will actually bolt to the bumper. They need to be bolted to a flat surface on the bumper and in most cases, the bumper will need to be modified and...
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view full answer... - Installation Instructions for Installing a Diode Kit for Tow Bar WiringSounds like you are trying to use a diode kit like the Roadmaster Diode kit part # RM-154 to install tow bar wiring on a vehicle with separate function taillights. Running the wiring kit to the front turn signal of the tow vehicle wouldn't work because it would only cause the front blinkers to illuminate. This would be pointless since it's the back lights you want to illuminate. The diodes of this kit prevent backfeeding, so the front lights would illuminate but not the back. To see how...
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view full answer... - Tow Bar Wiring to Dolly Tow a 2014 Toyota Corolla Behind a Motor HomeSince you already have converter # 118158 all you will need is the 4-diode kit, # RM-154, and 2 additional diodes, # RM-792, to make a 6 diode kit. I have included a video of an example installation you can use as a guide and a link to the instructions for you. To connect to a 7-Way connector on the RV you can use a 7-Way to 4-Way adapter, # HM47065.
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view full answer...
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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.