See what our Experts say about this Pollak Custom Fit Vehicle Wiring

• Towing a Trailer with Electric Brakes with a Semi Tractor with Air Brakes
  To tow your trailer that uses an RV style 7-way blade style connector with your semi that has a 7-pin connector, you need to construct an adapter that will also combine the brake signal into the right and left directional signal pins. This can be done by using a female 7-pin socket # PK11720 to accept the plug from the semi, a tail light converter # 119178 and a female 7-way RV blade-style socket # PK12-707E. The converter would be wired in between both sockets to combine the brake light...
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• How To Find Cold Side Of Stop Light Switch On Vehicle For Brake Controller Installation
  Normally you can find the brake light switch under the dashboard at the top of the brake pedal. There could be a number of wires attached to the switch so you can use a tester like part # PTW2993 to test the wires. Since the auto manufacturers can use different color wires it is always best to use a tester and check the wires for function and not color. You would need to find the wire that only shows power when the brake pedal is pressed. That would be the wire that gets attached to the...
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• What Color Wires Go Where On Trailer 7 Way Harness?
  I linked an faq with wiring diagrams to show the standard colors for most 7 way trailer harnesses. That said, color is not always best to go by, so you'll want to take a circuit tester # PTW2993 and test each function before wiring the harness to your trailer. If you can tell me which vehicle you have or send in a photo, I can better help you.
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• Parts Needed to Tow Trailer with 7-Way Blade Connector with 7-Pin Connector Off of Commercial Dump
  We do have exactly what you are needing to tow a trailer with the standard 7-Way blade with your commercial dump. To combine the turn/brake signals from your tow vehicle you simply need to use the Roadmaster Brite-Lite Wiring Converter # RM-732. After making those connections use a 7-Way blade connector like the Hopkins Endurance # HM47210 for a dedicate connector for the trailer. Just connect the following wires from the Hopkins Endurance to the following functions on your tow vehicle: White...
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• Is the Pollak 7-Pole Round RV-Style Trailer Connector Socket Available in Metal?
  Hey Patti, thanks for reaching out! The Pollak 7-Pole Round RV-Style Trailer Connector Socket # PK94KR is available in a metal style as part # PK11720 on our site. Please note that this has the 7-Pole round pin style (see attached photo) which is used more in an agricultural setting, so you just want to make sure your trailer has the same style of connector. Are you looking to replace, or upgrade your current socket?
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• Adding Reverse Lights To Semi Trailer 48 Foot Flatbed Through Connecting to 7-Way
  If you use the 7-way that is used for commercial/industrial/agricultural application like # PK11720 or the RV/standard 7-way like # HM47210 you will need to utilize the same location. The reverse signal should be connected to the center location of either application. You will simply need to make sure your wiring corresponds with the function locations. I've attached a photo to assist. For a 7-pin that normally does not have a reverse light, that means utilizing the auxiliary in the...
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• Finding Stoplight Circuit for Installing Brake Controller in 2004 Jeep Grand Cherokee
  We luckily had the chance to install a brake controller in a 2004 Jeep Grand Cherokee just like yours and we found that the cold side of the brake switch wire was purple and brown. I attached an install video that shows the P2 part # 90885 installed in a 2004 Grand Cherokee just like yours.
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• Recommended 7-Pole Round Plug & Play Wiring Harness Adapter for 2005 Ford Super Duty Factory Wiring
  It sounds like your 2005 Ford Super Duty was outfitted with the 7-way blade system which is the most common in the market today. To adapt your 7-way blade to a 7-pole round for your trailer, I recommend the Pollack # PK12728. This 7-pole connector is prewired to simply plug into your truck's 7-way plug. It has the # PK11720 connector you referenced but is pre-wired like you are desiring. A great mounting bracket for the # PK12728 is the # PK11771. I have linked all the above mentioned...
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• Converting 7-Way On Semi To Work With 7-Blade And Operate Electric Brakes
  Hello Juan, thanks for reaching out. There are a number of factors involved when converting a semi 7-way to an RV 7-way. Semis generally use a 7-pin round pin socket, similar to # PK11720. And RV style 7-way uses blades, like # PK12706. We do not offer any pre-made adapters to make this conversion that will carry all of the electrical functions required by the RV. Another thing to be aware of is fifth wheel trailers use a combined wiring system where the brake lights and turn signals are...
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• Do You Have a 7-Pole Round to 7-Way Blade Adapter
  Hey, Brian! We do have just the adapter for you! We have the Pollak trailer connector adapter part # PK12-724. This adapter adapts 7-round pin to 7-way blade trailer connector seamlessly. I'll also include the other Pollak adapter part # PK12728. It's pinned the opposite of the first adapter. I wanted to mention it just in case I misunderstood how your pins were on your semi. Figured better safe than sorry.
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• Availability of 7-Pole Round Extension Cord
  Hi Tim; we don't have anything for a 7-pole round but I can give you the parts to make one. If you want female to female you will need two of the # PK11720 along with the Deka Wire - Jacketed 7-Wire # DW04914-1. The wire is sold by the foot so you can make it however long you need it to be. If you want a male end for one side to make a standard extension you can use the # PK11702.
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• Converting a Semi 7-Way Trailer Connector to an RV 7-Way Trailer Connector
  There are a number of factors involved when converting a semi 7-way to an RV 7-way. Semis generally use a 7-pin round pin socket, similar to # PK11720. And RV style 7-way uses blades, like # PK12706. We do not offer any pre-made adapters to make this conversion that will carry all of the electrical functions required by the RV. Another thing to be aware of is fifth wheel trailers use a combined wiring system where the brake lights and turn signals are on circuit. Your semi connector...
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• Adapting 7-Way Round Pin on Mack Semi-Tractor to 7-Way Blade Style RV Connector
  A 7-pin connector on a Mack Tractor like you described would function a bit differently than a 7-way blade-style RV connector. The difference is the right and left turn pins on the 7-way blade also carry the signal for the brake lamps while on the 7-pin, one pin carries the right turn lamp, one the left and another carries the brake lamp signal. In order to combine those three signals onto two circuits, you'll need a taillight converter. There isn't an off-the-shelf adapter that'll do...
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• How to Make 7-way to 6-Way Adapter for Semi Truck to Gooseneck
  Your semi-truck is going to have separate turn signals from the stop lights and your gooseneck trailer is going to have combined turn signals and stop lights. This means you would have to build an adapter that has a signal light converter so that your trailer can be towed with your truck. You would need to start with a 7-way male connector part # PK11893 to plug into your semi truck. For wiring you would then want the part # DW04914-1 sold by the foot. Then for the signal converter you...
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• 7 Pin over 7 Blade Which One is Better and Why?
  I would say the 7 blade connector is better and that answer is based on availability and common use. The 7-Way blade style trailer connector is the most common 7-Way in use at this time. If you are making a choice today I would recommend going with a 7 blade like the Hopkins Endurance item # HM48470. However, if you already have a 7-Way round connector you can just use an adapter like the Pollak Trailer Connector Adapter 7-Way item # HM47425 when needed.
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• How to Make a 5-Way Round Pin to 7-Way Round Pin Trailer Connector Adapter
  A 5-Way Round to 7-Way Round trailer adapter is not available, but I can tell you how to make one and what you will need. If the 5-Way round is on the vehicle, you will need the following: 5-Pole, Round Pin Trailer Wiring Connector, # PK11501 7-Pole, Round Pin Trailer Wiring Socket, # PK11720 7-Pole Rubber Socket Boot, # PK11761 Jacketed 6 Wire - per foot, # DW04906-1 (get 2 feet worth) Start by testing the functions of the 5-Way with a circuit tester, # PTW2993 if needed. Once you know...
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• Is it Better to Switch to a 7-Way Blade Style Trailer Connector Over a 7-Way Round Pin
  The 7-Way blade style trailer connector is the most common 7-Way in use at this time. It would be beneficial to switch to this style. However, if you already have a 7-Way round connector you can just use an adapter to go to a 7-Way blade style when needed. You can use # HM47425. If you want to go ahead and switch from the 7-Way round to the blade style I recommend a multi-tow connector, # HM48470, which has a 7-Way blade style, a 5-Way flat, and 4-Way flat. All you will need to do is remove...
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• Flush Mount Female 7-Way Trailer Connection
  I recommend the Pollak Metal 7-Pole # PK12703 as being the most flush mounted 7-blade available. This will push more the plug inside the camper which will cause the interior to require more space than the others. The Pollak Heavy-Duty, 7-Pole # PK11720 that you referenced uses the less common 7-pin connection and will most likely not work for your application.
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• Mounting Hole Dimensions for the Pollak Heavy-Duty, 7-Pole, Round Pin Trailer Wiring Socket
  The distance between the mounting holes for the Pollak Heavy-Duty, 7-Pole, Round Pin Trailer Wiring Socket # PK11720 is 3" on center. I have attached a photo to demonstrate this as well as a review video where this measurement is shown. We also carry the Pollak Bracket # PK11771 which can help make installing this socket easier. This has 1/4" diameter holes to mount the socket and then 1/2" x 3/8" mounting holes for the bracket itself. The mounting hardware is sold separately but can be...
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• 6-Pin Round Vehicle Connector To 7-Pin Round Commercial Trailer Connector
  I have a couple options as there is not one adapter from a 6-pin round vehicle connector to a 7-pin round commercial trailer connector. The first will combine a Adapter 6-Pole to 7-Pole Trailer Wiring Adapter # 47435 and a Pollak Trailer Connector Adapter # PK12727 to adapt your connections. Or you can wire in a Pollak 6-Pole, Round Pin, Trailer Wiring Connector # PK11604 to a Pollak Heavy-Duty, 7-Pole, Round Pin Trailer Wiring Socket # PK11720. This will create your own wiring adapter....
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• How to Wire the Pollak 7-Pole, Round Pin Trailer Wiring Socket - Vehicle End # PK11720
  On the back of the Pollak 7-Pole, Round Pin Trailer Wiring Socket - Vehicle End, part # PK11720, it is marked alongside the pin with the color of the wire that connects to that pin location. I am also including a photo that will show a 7-Way round pin connector for the vehicle end with the colors and functions listed for each pin. I am also including a link to a FAQ page on trailer wiring.
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• Agricultural Type 7-Way Vehicle Socket for Trailers Using Round-Pin 7-Way Plugs
  7-way trailer connectors can be wired in several ways and heavy-duty commercial/agricultural round-pin 7-way wiring can be different too. Please refer to the linked image to see the different vehicle-side connectors and their common wiring configurations. To use your trailers that have plugs like # PK11702 with your F-250 you will need to install a socket such as # PK11720. A circuit tester like # PTW2993 will help you identify the function on each wire of the truck's existing 7-way. The...
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• What Wire Color Codes and Functions Are Used for Pollak Connecter 12-705 and PK11720
  There is no industry standard wiring code. Pollak uses the following: White - Ground Return Black - Clearance, Side Marker, Identification Yellow - Left Turn and Hazard Signal Red - Stop Lamps and Anti-Lock Devices Green - Right Turn and Hazard Signal Brown - Tail, Rear Clearance, Marker and License-Plate Lamps Blue - Auxiliary Circuit/ABS We have a different combination of colors we use for specific functions which you can see in the wiring FAQ article that I have linked. Finally,...
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• Parts Needed To Make A 7-Way Round Pin Extension
  Though we can get you what you will need you will have to assemble it. There are three parts that you will need to make a round 7-way round pin connector they're listed below: The Male 7-Way Round Connector # PK11702 Jacketed 7-Way Wiring (Sold by foot) # DW04914-1 you will have to purchase the quantity in the amount of extension length you will need. 7-Way Female Connector # PK11720 These three parts will easily wire to each other making your the 7 pin male to female trailer connector....
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