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Vehicle to Vehicle Tail Light Converter

Vehicle to Vehicle Tail Light Converter

Item # 118158
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Tow Ready Wiring - 118158
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Used when a motorhome with a 2-wire system is towing another vehicle with a 3-wire system, by way of a tow bar. Lowest Prices for the best wiring from Tow Ready. Vehicle to Vehicle Tail Light Converter part number 118158 can be ordered online at etrailer.com or call 800-298-8924 for expert service.
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Tow Ready Wiring - 118158

  • Trailer Connectors
  • Converters
  • 2-to-3 Converter
  • Tow Ready

Used when a motorhome with a 2-wire system is towing another vehicle with a 3-wire system, by way of a tow bar.


Features:

  • Used when a motorhome is towing another vehicle by way of a tow bar
    • If the towing vehicle has a 2-wire system and the vehicle being towed is on a 3-wire system (the vehicle has amber turn signals, separate from the brake signals), the vehicle to vehicle tail light converter will need to be used
  • This item cannot be installed backwards (the input going to the output side) to convert a tow vehicle down
  • Will not work with vehicles that have LED tail lights
  • Limited 1-year warranty


Note: You will need to install a tail light isolating diode system (38955) and 2 additional diodes (RM-792) with this tail light converter to prevent electrical feedback when flat towing a vehicle. Vehicles with separate turn signals and brake lights will need a total of 6 diodes.



118158 Vehicle to Vehicle Taillight Converter

Replaces 31820

Installation Details 118158 Installation instructions


California residents: click here


Video of Vehicle to Vehicle Tail Light Converter

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.




Video Transcript for Tow Ready Tow Bar Wiring 118158 Review


Customer Reviews

Vehicle to Vehicle Tail Light Converter - 118158

Average Customer Rating:  4.8 out of 5 stars   (91 Customer Reviews)

Used when a motorhome with a 2-wire system is towing another vehicle with a 3-wire system, by way of a tow bar.

- 118158
by:

I used this box to stop my third brake light from blinking on my 74 Ford Bronco. Worked perfectly! 471723



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This product was used to separate the brake light signal from the turn light signal on a Ford F-350 cab/chassis with a flatbed to facilitate using amber turn signals without them illuminating when the brakes are applied (truck only, no trailer). So far they are "functioning as designed" and I'm very happy with the product. 572713


Comments
Still working fine.
Gregory V - 10/09/2019

62769

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Great product and the price was lower than expected. 341569



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I just got done installing it today it worked as described and was very easy to install I highly recommend this product 336690



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I purchased this tail light converter over a year ago. This eliminated the problem of electrically connecting a European trailer to my U.S. spec Dodge Dakota truck. It was easy to install and works perfectly. I also appreciate etrailer waiting a year before asking me to review this product as most on line vendors ask for a review before the item is received. 315088



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I was looking for a way to add a third tail light to a vintage trailer and this proved to be just the ticket. Easy to install and worked great right out of the box. Plenty of communications from etrailer staff along the way. Just wish they would provide tracking info so you could plan for expected receipt date. 97067



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This is a very useful device for those of us who flat tow auxiliary vehicles, such as a tracker behind a motorhome or whatever. Also it is easy to install. Keith 406122


Comments
converter works well. I have had no problems. I use dielectric silicone grease on all connections.
Keith K - 07/15/2018

40945

- 118158
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I like having my trailer lights showing my trun direction and then also show that I have applied the brakes. This units splits the signal and works great. Real easy to wire in. You will probably need to only run one wire to add the brake light function. 344326



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Holding up very well. I built an adapter for my German trailer and with the help of your department and your products was able to save myself about 300 euro. Much thanks! 472165



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I used this to change the wiring and harness on a European trailer to work with my standard US 4-pin trailer outlet. Pretty simple and straight forward with the diagrams and write-ups that I found on this site. 489560


Comments
The parts are still on my European trailer and working well! The trailer is a German brand and started its life there in Germany being pulled by my American-spec Jeep Wrangler. The trailer’s wiring and the Jeep’s connections needed to be massaged in order to work. The parts I ordered from etrailer and the writeups for the project on your site made it all possible. Now the trailer is titled and registered in Virginia and enjoying its life on this side of the Pacific!
Aaron - 03/27/2019

51092

- 118158
by:

Unfortunately this did not work for my purpose, not that the product was at fault. I was trying to retain the amber turn signals on my vehicle when flat towing but what I found is the Motorhome already has a taillight converter in the system because it too has amber turn signals. the two converters did not get along. I had to remove it and rewire to combined signal and brake lights 583040



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by:

First off the customer service at etrailer is by far the best that I have dealt with. If I had a question, they sent me an email response very quickly. Secondly, the shipping is extremely fast. I placed the order and it came to an APO AE address (military stationed in Germany) via USPS Priority Mail and it arrived in like 5-7 days, I was shocked when it arrived, because I was expecting at least another 3 or 4 days. So, as far as the product. Works great and was just what was needed. Project was to make an adapter that I could plug into my 2017 Jeep Grand Cherokee U.S. spec and use a German trailer. My friend did all of the wiring and made the adapter, so I do not take any credit for any of it. Just sharing this, to those trying to figure out if it can be done. Moving on, the adapter is a 7 pin/blade normal American plug that goes into the back of the JGC and the other end of the adapter is the 13 pin German (European) socket. We tried it without this product and all worked except when you hit the brakes the brake lights were faded and the blinker lights were lit up as if they were the brake lights. So, had to get this product and separate the brake/blinker light on the American side and have separate brake and turn wires on the German side. Put this product between the two in the middle of the adapter, wired it up and all works great! I used 2 zip ties around the product and a bunch of electrical tape to hold it to the adapter, at least to give it a better look. Now I only have to plug in the adapter whenever I use a German trailer and all works correct. When done towing, remove the adapter and everything is back to the American system. Did not have to cut/splice or do anything to the wires on the JGC or the trailer, all was done at the adapter. Thanks again to etrailer for providing awesome customer support and shipping! Jeff 397630



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Installed and forgot about it. It was easy to wire up and has been working perfectly since. RV is combined turn and stop lights. VW has separate amber turn lights. 476281



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Interested in adding a third light up higher on your trailer for additional visibility? This product will separate the turn signal and brake signal on a four pin connector so you can add a running and brake light up higher to be visible. Simulates the third light that most cars and trucks have these days in the center of the back window. Positive for the semi-trucks visibility. You do not really think they can see the normal trailer lights 12" off the ground when following close behind or coming over a hill do you? Included a picture with just the running lights illuminated. Thank you etrailer for having the right products in stock! Most other dealers did not know what I was talking about and one even told me it was against the law. Called state highway patrol and they encouraged the additional third light! I also added the higher side running lights when semi's are merging behind you at night. 563855



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I mounted a juction box on the front of the trailer and connected my 4-wire trailer connection to it. From this box I ran a ground wire to all lights and to the convertor input, the green right turn/stop to the convertor input, the yellow left turn/stop to the convertor input, the brown to my tail lights, license plate light, marker lights and clearance lights. I ran the 3 wires from the convertor output to another juction box. I connected the green right turn to the right amber light, the yellow left turn to the left amber light, the red brake to the red right and left brake light and the third brake light. No diodes needed. I'm using your Bargman LED Double tail light Red and Amber and Bargman wraparound clearance/side marker red on rear amber on front. You people at etrailer are "THE BEST". I believe you are the only outfit that knows your products and can tell us how to install them! 12888



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I gave up trying to find a wire to tap for a third brake light on a 2013 GMC Sierra, so I ordered a 2 to 3 wire adapter ( #118158) as recommended by you expert Michael H. He stated that only one of the inputs was needed, but both Left and Right turn were required to make mine work at all. That aside, the product was received quickly and installation was simple using the enclosed diagrams. I have never seen anything mentioned anywhere about waterproofing undervehicle connections. I do and they last for years. 108554


Comments
Does the 3rd brake light flash when using the hazard lights?
-- comment by: Sam - 05/06/2015

11440
Comments
Yes, emergency flashers will flash the third light also.
-- comment by: - 05/24/2015

12007

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I use Optronics oval LED lighting exclusively and I don't think this was made to work with them because of the rapid response of the LEDs. I use this so that on a 4 wire system I can have turn signals on the side of the trailer. When you first hit the brakes, there is a fast blip of light from the side marker/turn signals. With an incandescent bulb it would be too fast to light the bulb. This is something I can live with. I think this works great with no problems so far. 524581



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This converter worked great for what I intended it for. I was wanting to add a third brake light to back of my fifth wheel trailer. I purchased STL179RB Glolight Thinline LED also. I tried to wire this direct. It won't work, it flashes when you turn the turn signal on. A friend of mine recommended this after doing a search on the etrailer website. Etrailer support recommendation was installing two lights. Duh! that's why I wanted a third brake light, I already have two lights that function as stop/tail/turn. The installation in these pictures is not complete. I was trying to avoid drilling holes in the back of my trailer, I still may have to. I am going to enclose the wires going up the trailer to the light in some white wire loom. The light at present is secured with only white RTV, not sure that will hold. I'm still trying to avoid drilling new holes, may have to though. I hooked up all the wires on the input side, white to ground, green to right stop/turn, yellow to left stop/turn. I hooked only the red wire to red wire of the light on the output side. I hooked the ground (white wire) of light to input side of converter. Yes, it works and no it does not blink when either blinker is turned on. The additional two wires on the output side of converter are not being used nor is the additional wire of the light. Sorry for the long review, don't usually write reviews at all. Anyway, if this will help even one person it will be worth it. 428692



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Great product & great service. Guys keep up the good work. Thanks Rick 735067



- 118158
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Shipping was fast. Installation was easy. Works as designed. Couldnt ask for a better result. Now my tow car is all wired correctly. 728438



- 118158
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This is the second time ordering from etrailer. Both experiences have exceeded my expectations. Items were as described and arrived quickly. Customer service is great too. This is the place to go for all your trailer needs. I highly recommend. 705451



- 118158
by:

Parts stores had no idea this item was available. etrailer.com had it is stock. Now I can tow my trailer with any vehicle. 683391



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I like this product, and it was easy to connect for a third (3rd) brake light on our travel trailer. 683186



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Excellent customer service. Excellent product quality and etrailer cares that you are satisfied. We hope to be purchasing more products soon. Would highly recommend etrailer. 616619



- 118158
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I tried wiring this to a current model F-150 to attempt to separate the brake signal out at the rear from the indicators. It didn't do as it was supposed to in this situation. most likely due to the sensitive circuits in this vehicle as it would send faults up on the dash display. but also didn't seem to operate correctly either. Also made a heck of a noise when mounted in the cabin so i would suggest mounting it externally. I assume it will be suitable in older vehicles. 607880


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Ask the Experts about this Tow Ready Wiring

  • Installing Roadmaster Diode Wiring Kit # RM-15267 with Separate Wiring on RV and Towed Vehicle
    If both your motorhome and towed vehicle have a 3-wire system (separate stop and tail lights), then a converter like the Tow Ready # 118158 should not actually be needed. The converter is only needed if your motorhome has a 2-wire system (combined stop and tail lights) and your towed vehicle has the separate, 3-wire system. I have attached a wiring diagram that shows exactly how the kit should be installed for your specific application, where both the motorhome and vehicle have a separate...
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  • Adapter for Truck Wiring To Wire Third Brake Light of Camper Shell
    What you can do is use the converter box part # 118158 wired to either you taillight wiring or trailer wiring and you'll have a dedicated stoplight circuit on the red wire. If you ground the white wire and then run the green wire to the right turn circuit and the yellow to the left turn on the input side of the box the red wire on the output side of the box will have just the stoplight.
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  • 3 Wire to 2 Wire Converter to Combine Separate Brake Light and Turn Signal Circuits
    Vehicle to Vehicle Tail Light Converter # 118158 and the Curt version, # C56196, both take combined brake light and turn signal circuits and separate them out. You are looking for the opposite which is basically what any trailer wiring harness with a converter for a vehicle will do. If this is for a flat tow set up or an application other than towing a trailer you could use Brite-Lite converter # RM-732. If it is going on a vehicle to tow a trailer then I would need to know the year,...
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  • Ways to Convert Trailer to LED Type Lighting
    You can convert your RV to separate turn signals and/or LED operation in a couple of ways, depending on how much wiring modification you care to do. Any of your existing lights can be converted to LED operation by swapping out the incandescent bulbs for LED-type replacement elements. We have LED equivalents that are drop-in replacements for many popular standard bulbs. All appear on the linked page and can be selected by bulb number, such as the popular 194 type bulb # A194B that can...
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  • Parts Needed to Connect European 7-Pin to U.S. 4-Way Flat
    There are a few parts you will need, and this will require you cutting off your European 7-pin. First, you'll need a U.S. 4-way, the Hopkins Endurance 4-Way Flat Trailer Connector # HM48110, along with Converter # 118158. If you take a look at the accompanying diagram, you can see exactly how to wire the converter to the 4-way and you will need to do this with Butt Connectors - 22-18 Gauge # DW05743-5 and 16-14 Gauge # DW05744-5.
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  • Parts Needed to Connect Vehicle with 4-Pole to Trailer with 6-Way and Separate Brake Lights
    Since your vehicle's 4-pole wiring harness uses stop and turn signals that are combined on one wire, the green and yellow wires, you will use Vehicle to Vehicle Tail Light Converter # 118158 which takes in those combined signals and separates them out onto individual wires at its output side. Your Brown running light wire will simple bypass the converter and go directly to the trailer connector. Rather than use adapters to connect the tow vehicle and trailer I suggest you wire in a matching...
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  • Parts Needed to Add 3rd Brake Light to Small Utility Trailer with 4-Pole Wiring
    To add a 3rd brake light to a trailer's existing lighting will require a signal converter to separate out the brake signal from the turn signals that are combined by trailer wiring. You need the converter # 118158 to provide a brake-only output signal to prevent the 3rd brake light from flashing like a turn signal. In your particular application you will not need diodes but you may need a load resistor # P230004C to let the high-efficiency LED brake light function correctly with other...
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  • Tail Light Converter for 2013 Ford F-150 for Brake Light Signal for 3rd Brake Light on Truck Cap
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  • Can LED Lights on Boat Trailer Guide Posts be Wired as Running Lights, Turn Signal and Brake Lights
    The lights on the guide posts on your boat trailer have only one input wire and one ground wire. You would be able to have them be powered by the running light circuit or the turn signal/brake light circuit but not all 3. Usually the guide post lights are wired into the running light circuit so they can be seen all the time at night.
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  • Towing a US Trailer with 4-Way with an Australian Vehicle with 7-Way Flat Connector
    The best way to get a US trailer to work with a separate wiring system is to go ahead and just add amber turn signals to the trailer. That way you just need the 2 turn signal lights and the proper trailer side connector to match the one on the tow vehicle. Converter # 118158 would not be needed. I have linked the lights we have that can be used as turn signals. The other way would be to combine the circuits on the tow vehicle and install a 4-Way flat connector on it to match the trailer...
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  • Why are Diodes Needed for Lighting when Flat Towing a Vehicle
    When a vehicle is being towed it cannot operate its own lights. The diodes are a gateway with 2 inputs and one output. One input is the regular wiring on the vehicle. The other input is from the RV. Since vehicles being flat towed will not have working lights they will have to get power to function from the RV. The diodes allow for 2 inputs so that you don't have to disconnect the vehicle lights to plug in power wires from the RV. The tow vehicle lighting system only matters if the tow...
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  • How to Wire a Towed Vehicle With Seperate Turn and Brake Cicuits on Towing Vehicle
    If the vehicle you are towing with has separate stop and turn signals then it will need to be wired with a Modulite converter so that it can run the lights on the vehicle you are towing that does not have separate turn signals and stop lights. If the vehicle you are towing with is already setup to tow a trailer then the Modulite converter is most likely already installed. If you are towing with the 1994 Ford Ranger mentioned above then you will need to wire it with a 4-way connector...
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  • Flat Towing Wiring for Suzuki Samurai with Separate Tail Lights
    Although there are two different methods of wiring a towed vehicle that uses separate turn signals, we recommend using the 6 diode kit part # 154-792-118158, which includes the converter you mentioned. I will link you to several of our flat towing FAQ articles, one of which will tell you exactly how to wire your Samurai. Refer to Option # 2 on the Diode Installation Instructions for a Dinghy with Separate Tail Light Wiring FAQ page. Keep in mind that in addition to a tow bar, base...
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  • Can 2-Wire to 3-Wire Tail Light Converter be Used on a Vehicle Just to Separate Signals
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  • Does Converter Need to be Used to Match Truck Wiring to Trailer Wiring
    That all depends on if your trailer lights have the stop light circuit combined with the turn signals or not. If the stop light and turn signals are combined then you should be good to go but if they are separate you will need to install a converter like part # 118158 to separate the stop and turn signals and match your trailer.
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  • Wiring an RV with Separate Brake and Turn Signals to a Chevy HHR with Combined Brake/Turn Signals
    Probably the easiest solution is to first use a 6-Way to 4-Way adapter, like # PK12717, and plug the 6-Way side into the motor home. Next, add a light kit to plug into the 4-Way flat part of the adapter, like Magnetic Towing Light Kit, # C-ATL20A. Mount the lights on a metal surface on the HHR and you have lights for towing your HHR. For a more permanent solution, you could install the Tail Light Isolating Diode System with Wiring Harness, # 38955. After installing the diodes, plug the...
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  • Can Tow Ready Vehicle to Vehicle Tail Light Converter 118158 Power LED Lights
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  • Wiring of a European Trailer That Uses a 13-Pin Connector on a Ford F-150 with 4 and 7 Way Connector
    Unfortunately, we do not carry the European style connector you are trying to locate. On a European 7-Way trailer connector, the connector is pinned out differently than those used in the United States. They also use more wires to cover the same functions as a U.S. wiring configuration. So it would be much more beneficial to wire the trailer to work with a U.S. configuration rather than to convert and adapt the existing trailer wiring. You will need a vehicle to vehicle tail light...
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  • Adapter Needed to Power Taillights of Camper that Have Separate Turn Signals and Brake Circuits
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    view full answer...
  • Troubleshooting Replacement Bargman LED Trailer Lights
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    view full answer...
  • How to Wire Up a Trailer with Separate Taillights to a 4-Way
    You are going to need two thing, a taillight converter like part # 118158 and a trailer side 4-way like part # W787264. You will need to cut the connector off of the trailer and then wire the # 118158 to the trailer wiring like the diagram I attached to the right shows and then wire the # W787264 to the wires on the input side of the converter.
    view full answer...
  • How to Add a Third Brake Light to a Trailer
    For adding a third brake light only to your trailer I recommend converter # C56196 because the Tow Ready one could have problems with an LED light. Converter # C56196 does the same thing; it takes combined turn signals/brake lights and separates them. In order to add a third brake light I recommend also using diodes, # RM-690 for one, to prevent any backfeeding or bleed over. You would splice a diode into the yellow and green wires on the converter. Then splice the yellow wire to the...
    view full answer...
  • Two to Three Wire Converter that Works with LED Trailer Lights on a European Trailer
    We do have a converter that will work with LED lights but # 118158 does not work well with LED lights. Instead I recommend Curt converter # C56196 which does work with LED lights. I have included a link to a video review of this converter for you.
    view full answer...
  • Wiring A 2009 Honda Fit To Be Towed By A Fleetwood RV And A 2007 GMC Envoy
    Wiring the different vehicle systems can be a bit confusing but once you know what wiring system your vehicles have and get the proper instructions, you will be able to wire the vehicles. Your 2007 GMC Envoy most likely has a factory 7-Way connector at the rear of the vehicle which is converted to a 2 wire system so you will need to wire the Honda Fit to work with that system. If your motor home has a trailer connector at the rear, it is most likely converted to a 2 wire system also. You...
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  • How to Tow a US 4-Pole Wired Trailer with a European 7-Pin Wired Vehicle
    It is possible to tow your US wired trailer with your European wired vehicle, but the solution with either be to install a new, or separate, trailer connector on your vehicle, or making an adapter from a few different parts. The main difference between European trailer wiring and US trailer wiring is that European trailers typically use a 3-wire system and US trailers use a 2-wire system. The 3-wire system means the trailer will have separate wires for the turn signals, brake lights...
    view full answer...

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Info for this part was:

Expert Research:
Mike L
Expert Research:
Robert G
Expert Research:
Michael H
Expert Research:
Jeff D
Expert Research:
Jameson C
Expert Research:
John H
Expert Research:
Adam R
Expert Research:
Rachael H
Expert Research:
Jeffrey L
Video Edited:
Jacob T
Updated by:
Adele M
Updated by:
Laura H
Updated by:
Sarah W
Updated by:
Alexander C
Updated by:
Isabelle B
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