Pollak 7-Pole and 4-Pole Trailer Connector Sockets w/ Mounting Bracket and Wiring - Vehicle End

Hopkins Wiring - HM40975-11998

Tow a trailer with either a 7-way or 4-way plug with this dual vehicle-end connector. Included pigtail harness hardwires into your vehicle and the connector end mates with the 7-pole socket to form a weathertight seal.

Features:

• Dual connector lets you hook up to a trailer with either a 7-pole, RV-style plug or a 4-way flat plug
• Pigtail harness hardwires into your vehicle and connects to 7-way socket
  • Includes color-coded 7-wire leads and 1/2" convoluted tubing
  • Forms weathertight seal on back of socket to keep out moisture and prevent corrosion
• Rubber gasket provides excellent weather protection
• Integrated stainless steel spring lets you easily open and close socket covers
• High-impact ABS plastic construction is extra durable
• Sturdy steel mounting bracket installs on bumper with included screws
  • Black epoxy coating resists rust
• 1-Year warranty

Wiring Configuration

40975 Hopkins 7- and 4-Way Trailer Connector Socket with Mounting Bracket - Vehicle End

11998 Pollak Pigtail Wiring Harness for 7-Way RV Socket

Video of Pollak 7-Pole and 4-Pole Trailer Connector Sockets w/ Mounting Bracket and Wiring - Vehicle End

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

Trailer Wiring Harness Installation - 2002 Chevrolet Silverado

Trailer Wiring Harness Installation - 2008 Ford F-250

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Adapter 4 Pole to 7 Pole and 4 Pole$22.95

Curt Trailer Connector for Ford and GM Trucks - Backup Alarm - 7-Way Blade and 4-Way Flat$25.72

Adapter 4 Pole to 7 Pole Vehicle End Trailer Connector$17.45

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Ask the Experts about this Hopkins Wiring

• Brake Controller Recommendation and Installation Tips for a 2011 GMC Terrain
  
• Since your 2011 GMC Terrain already has a 4-Way trailer connector, you will just need to use a 4 and 7 Way Installation Kit, # ETBC7. This will provide the 7-Way connector, mounting hardware, and the wiring and circuit breakers needed to install a brake controller. I have included links to an FAQ and a video that will help you with the installation. The only other part you may need is a circuit tester, # 3808, unless you already have one. For a brake controller, I recommend the Tekonsha P
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• Interior Lights Not Working in a New Trailer with 7 Pin Wiring Harness on a 2002 Jeep Liberty
  
• It sounds like you may need to install a fuse in the fuse block under the hood on your 2002 Jeep Liberty to get the 12 volt power circuit at the OEM 7-Way connector to work. But the first thing I would do is check the bulb just to be sure it is not bad, then check to see if the interior trailer light is connected to the running light circuit. Turn on the running lights and if there is a switch in the trailer make sure it is on. If the light does not light, then you can check the power circuit on
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• How to Install a 7-Way and 4-Way Trailer Wiring Connector On a 1995 Ford F-350 SuperDuty
  
• Installing a 7-Way and 4-Way combination trailer connector, like part # HM40975-11998, that you referenced, on your 1995 Ford F-350 is fairly easy, but for these trucks there are 2 different wiring situations if you do not have a factory 7-way trailer connector. If your vehicle has factory 4-Way trailer wiring at the back you can use the Pollak 7-Pole and 4-Pole Trailer Connector, # HM40975-11998, and splice the wires to the wires under the rear of the vehicle along the drivers side frame rai
  view full answer...


• Parts Needed to Install a Trailer Brake Controller on a 2011 GMC Terrain
  
• In order to install a brake controller on a 2011 GMC Terrain, you will need a few items. First, you will need to have a 4-Way trailer connector installed on the vehicle, # 118494, unless it already has one. Next, you will need a 4 and 7 way installation kit, # ETBC7. This will provide a 7-Way connector and all of the wiring to install it and a brake controller. Last, you will need the actual brake controller. I recommend the Tekonsha P2, # 90885 because it is easy to set up and easy to us
  view full answer...


• Adding a 7-Way Trailer Connector to a 2002 Ford F-150 with Factory 4-Way Flat Trailer Connector
  
• You should be able to trace the 4-Way harness towards the front of the truck and find where it connects to another connector. The connector should be square and look like the plugs for # 118242. Adding this harness and the relays/fuses it comes with will provide you with a 7-Way trailer connector. You could then just use an adapter, # PK12716, when you need a 4-Way. You could use # HM40975-11998 and hardwire it in to the factory wiring harness on the forward side of the truck. You would need
  view full answer...


• Obtaining Brake Stoplight Switch Signal for Brake Controller Install On 2011 GMC Terrain
  
• The brake stoplight signal can be accessed at the BCM, As you are sitting in the drivers seat, the BCM (Body Control Module) is located under the dash above where your left knee would be. The module (think of it as a junction box) will have 7 different wire connectors that plug into it. Look for the black connector (all the connectors are different colors) that has 26 different slots for wires to insert into. In wire position # 11, there will be a white wire that carries the brake stoplight sign
  view full answer...


• Locating Brake Stoplight Signal Location on 2012 GMC Terrain
  
• Use a circuit tester like part # 40376 on the wire in the # 11 terminal on the black BCM connector, as shown in the diagram I provided. The wire colors can vary during a production run, which is why we typically recommend that folks wire by function, not by wire color. As an alternate method, you can use a fuse tap like part # F2526 on the CHMSL (center high mounted stop lamp) fuse in the fuse box. The lid of the fuse box should have a legend that will tell you which fuse location is needed.
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• What are the Wiring Functions of the Pollak 7-Pole and 4-Pole Trailer Connector Sockets
  
• On the 7-Way and 4-Way trailer connector # HM40975-11998, the red wire is for Left turn and stop, white is ground, blue is electric brakes, green is right turn and stop, black is 12 volt battery power, brown is running lights, and yellow is for reverse lights. You will need to use a circuit tester, like # 3808 if needed, to test the wires on your truck to determine their functions. The 8th wire on your truck could be a dedicated brake light that might be used to power a light on a camper shel
  view full answer...


• Right Brake Light Pin On New 7-Way Trailer Connector Not Working on 2003 Chevy Silverado
  
• Since the original connector on your 2003 Chevy Silverado was so corroded it could have affected the wiring further back. Use your tester to test the wiring further forward on the truck to see if there is a point where the signal is good for both the turn signal and the brake light (they are on the same circuit). If there is then you will need to replace the wire for that circuit up to that point. Make sure the new harness is properly grounded as well. It is possible that there is a separa
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• Wiring Instructions for Curt Harness # C55362 w/ Pollak 7-Pole Connector, part # HM40975-11998
  
• The Curt T-Connector # C55362 connects to the tow wiring harness underneath your 2002 Nissan Frontier. The harness is located to the rear of the spare tire. Please refer to the photos in the instructions attached. The tow wiring connectors under your Frontier are to be separated, and the T-harness inserted between them. You will next need to secure the white ground wire to a bare metal surface with the supplied screw (or there may be an existing screw you can use for this grounding point). You
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• Troubleshooting No Right Brake Light on a Trailer Towed by a 2001 Chevrolet Silverado
  
• The turn signal and brake light circuits on your 2001 Chevrolet Silverado are separate and trailers typically require a combined turn signal and brake light circuit because they only use one bulb for both functions at the tail lights. If you have a factory installed wiring harness on your truck, these circuits should already be combined at the trailer connector. If this is the case, then the issue may likely be a poor ground connection on your trailer. I recommend checking the ground connect
  view full answer...


• How to Isolate the Brake Light Circuit on a 2013 GMC Terrain with Combined Tail Lights
  
• What you could get is a tail light converter like our part # C56196. What you would need to do is tap into the tail light wiring of your 2013 GMC Terrain and then you will have a dedicated brake light circuit for you to use. You would run the green wire of the input side of the # C56196 to the right stop turn of your vehicle. The white wire to a ground, and the yellow wire to the left stop and turn circuit. Once this is all hooked up the red wire on the output side will be a dedicated brak
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• 2001 Chevy Silverado 3500 Tail Lights Not Working and Brake Signal on 7-Way Not Working
  
• From what I have been able to find, the 2001 Chevy Silverado 3500 had what is called a 3-wire system. This means the turn signals are separate from the brake lights. If the lights you are using are designed for a 2 wire system then it they will not function properly. There are 2 possible options. First, you can get lights that do have separate turn signal functions. Second you can use a special converter on the truck wiring to take the separate signals and combine them to a 2-wire system (co
  view full answer...