7-way Plug Wiring

[Marilu Mandez]

Ifyour power cord has been lost or damaged, these kits contain a replacement power cord along with the plugs that install on each end of the power cord. They do NOT include the electrical sockets for the towed vehicle or RV.

For many years, motorhomes have come standard with a 7 way socket. Each of these power cords will plug directly into the socket. The other end of the power cord plugs into the towed vehicle. Different technicians will use different electrical sockets on the front of the dinghy. Make sure you order the power cord that matches your towed car's socket.

Roadmaster offers both coiled (Flexo-Coil) power cords and straight power cords. Flexo-Coils will extend (like an old telephone cord) and contract as you go around corners. If you add a drop hitch or extension, the Flexo-Coil will stretch to accommodate. Straight power cords are designed to route through the cable channels of Roadmaster tow bars. This prevents dragging and provides a clean professional appearance.

Roadmaster's high quality power cords are water, oil and chemical resistant. The electrical plugs are injected with silicone sealant to prevent wires from fraying or shorting, and to seal out moisture that can cause corrosion.

The 650814 is a straight blue power cord with one 7-way plug and one 4-way plug (not installed).

Note: On straight power cords, the electrical plug is prewired on one end only. The 2nd plug is installed after the power cord is routed through the tow bar channel.

I believe in Your previous posts You stated that this trailer has only six wires and You're using a seven way RV type plug. I still can't tell You without testing the connections which one is the ground but i'll give You a little further information that may help if you can find the ground. When a horsetrailer is wired with 6 wires they should be a wire for the following:

I have to ad an additional note on the wiring trouble that You're having, As I stated in the previous post it is very important to get the brake controller and ground wire in there proper place. Speaking of the type controller that I use,it's stated in the owners manual that if it is backfed that it can destoy the controller which could be very costly to You to replace.

If You're that unshure of how to rewire the plug I'd keep that in mind not to mention that if You mistakenly used a lamp for the ground it would cause a voltage drop across everything else including the brakes.

Custom wiring is the ideal solution for installing trailer light wiring on your vehicle. A custom wiring harness or 'T-connector' is a vehicle-specific harness that plugs in without any spicing required and provides a standard connector output, such as a 4-way flat.

A custom wiring harness has multiple plugs that are used to 'T' into the vehicle's taillight assembly, drawing power directly from the taillights or from a direct battery connection and providing a standard trailer light wiring connector. While custom wiring harnesses usually require two or more connection points, splicing and soldering are still not needed.

While some vehicles may not be equipped with a standard trailer wiring connector, they may have a special socket specifically intended for installing wiring, provided by the vehicle manufacturer. A custom wiring connector uses a single plug to plug into this factory socket and provide a standard trailer wiring connector.

Like a T-connector, an original equipment wiring harness plugs into the USCAR socket without any cutting, splicing or soldering required, and it provides a standard trailer wiring output, such as a 4-way flat or 7-way RV blade.

A taillight converter or electrical converter splices into your vehicle and provides a standard trailer plug wiring connector, typically a 4-way flat. The converter converts the vehicle's complex wiring system to be compatible with your trailer's simple wiring system. To learn more about vehicle wiring systems, check out our vehicle wiring systems guide.

Following the standard method for wiring a trailer connector is vital to the safety of your vehicle while towing. Connecting the wrong color wires will result in mismatched taillight functions and confusion on the road.

The traditional 7-way RV blade format is typically used on 5th wheel trailers, travel trailers and campers. The trailer wiring colors for this configuration are different than those on the SAE configuration.

Howdy,I have an Airstream 2019 Sport 22FBThe 7-pin on my new Tundra does not mate tightly with the Airstream one. I gather the rubber clad stock ones test as the worst over time anyways so time to upgrade. I have had trailer brake issues and this the last link in chain to address.I ordered a Pollak but understand I should not rely upon Pollak's wiring scheme to work. Pollak fits perfectly snug and secure where the stock wiggles and is loose even with adjusting connectors.I found electrical diagram in manual but only defines 4 wire colors and not where on the plug they go..See attached.. Does NOT illustrate which wires go to which sockets. Supposedly colors vary and not reliable indicators of what they power..

Is the 7 pole outlet on your Tundra the FLAT BLADE type as I usually see on Pickups and Campers orrrrrrrrrrrrr or is it the 7 pole ROUND PIN like I see on some semi trucks and sure some other vehicles including pickups ??????????? The picture up top looks like the ROUND PIN in the event that's what you happen to have ????

For a gazillion pictures and wiring diagrams if you have the BLADE TYPE 7 Pole (Or any for that matter including the round pin) see the Bing search page and I use " RV Industry Standard Wiring" as there can be some differences.

I really just need Airstreams color scheme as since most of not ALL trailers hook up to vehicles without and issue there vehicle side is standardized. SO If I know which pole carries which charge and which color wire Airstream used... easy peezy...

The existing is a Bargman molded rubber. I'm thinking the best option is to "dissect" it and physically see which color goes to which pole. But I'm not so sure it would be easy to do... I figure just start cutting away with a fine blade X-Acto type saw....

I wish I was to be in the same place longer... I'm crossing fingers the Toyota ECU update the dealer did solved the "trailer disconnect" warning I was getting but the connection is so loose it has to get changed eventually.

I'm thinking the best option is to "dissect" it and physically see which color goes to which pole. But I'm not so sure it would be easy to do... I figure just start cutting away with a fine blade X-Acto type saw....

Thank aztex, what you have (Pollak 7 pole) is what I suspected (why I posted that diagram) and what's often used on RV's and small trucks, which is the FLAT BLADE type NOT the ROUND PIN heavy metal type like some bigger trucks, sooooooooooo its RV Industry Standard Wiring (what you have ???) is as I posted above

As you mentioned its easy peasey to stick a 12 Volt test light on the Tundra's Receptacle/Outlet and verify which flat blade is which circuit (have helper use turn signals and brakes and activate electric brakes). Its a bit more complex to apply 12 Volt signals and Ground to the Airstreams Plug to see which lights or brakes etc. work BUT IT CAN CERTAINLY BE DONE

While the RV Industry Standard wiring diagram for 7 Pole Flat Blade is as I posted above, as a 49 year RV user and past dealer I have seen alllllllllll sorts of wiring lol. I've seen the center pin used for backup lights (standard) seen it used for 12 volt feed, seen it used for ground, seen it used for elec brakes grrrrrrrrrrrr.

FWIW I have the metallic Pollak 7 pole Flat Blade Receptacle/Outlet on the rear of my RV bumper but I believe (WILL HAVE TO GO LOOK SEE) a black plastic Bargman 7 Pole flat Blade Trailer End PLUG on my toad and other trailers I pull. Still MY BARGMAN PLUG FITS NICE N SNUG INTO MY POLLAK RECEPTACLE/OUTLET.

I'm sure you can get this now, I would suspect the Airstreams PLUG is wired RV Industry Standard ??? (see my original picture) and the Tundra is perhaps ??? likewise BUT I CANT SAY WHAT COLOR SCHEME WAS USED BY AIRSTREAM , I've seen different trailers wired with different color schemes grrrrrrrrrrrrrr As Im sure you're well aware there can be other wiring issues NOT PLUG causing problems.

A temporary fix is to duct-tape the trailer plug into the Tundra receptacle until you reach your next stop. You might also use a fingernail file to gently sand the contacts in both ends if they appear corroded.

That's simple enough, when you find the time to replace the offending trailer plug. I would not change the truck wiring in any case. It is likely wired to industry standards, any changes would prevent towing a different trailer.

There are a wide variety of trailer connectors. They can include anywhere from 2 to 7 wires. The type you use will be determined by the needs of your vehicle and trailer. Here we will cover some of the most common types. Below is a diagram of the typical 4 or 5 way trailer wiring. You should always confirm the actual wiring of your trailer before making a connection. Never assume the trailer or your vehicle is wired according to standards.

In addition to basic lighting functions, 6 Way trailer connectors include two extra wires/pins. Typically these are used for electric brakes and a 12V power lead. 6 Way round connectors are commonly found on horse trailers, whereas the flat style are seen more on campers. This type of wiring is less common now and if you are wiring a trailer, you should consider wiring it to the more common 7 way plugs.

In addition to basic lighting functions, 7 Way trailer connectors have three extra wires / pins. These can be used for electric brakes, 12V power, and backup lights. Round pin connectors exist, but are uncommon. Most feature flat blade type connectors. This is the most common style now wired onto new vehicles. You can get an adapter that will adapt your 7 way wired vehicle, to a 4 way wired trailer.

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