Adapter 4-Pole to 7-Pole and 4-Pole

See what our Experts say about this Hopkins Trailer Wiring

• Can 2 Batteries with Different Amp Hour Ratings be Wired in Parallel
  You can wire two batteries in parallel if they have different amp hour ratings, deep cycle or regular. You wouldn't mix two different battery types like gel and lead acid though. You will want the batteries to be of the same type; 2 gel, 2 lead acid, 2 deep cycle and so on.
  view full answer...
  
• Is the 12 Volt Hot Lead Required when Installing a 7-Way Trailer Connector
  Trailers that use 12 volt power for accessories or that have a battery will use the 12 volt circuit in a 7-Way trailer connector. If the trailer does not have those items then you would not have to make that circuit active. That means that you would not have to run any wire or install a fuse or relay associated with the 12 volt circuit.
  view full answer...
• How to Wire Two 6 Volt Batteries Together so that the Output is 12 Volts
  If the batteries are wired in series, the positive terminal of one battery will be connected to the negative terminal of the other. This would double the output of the batteries, assuming each battery is a 6 volt, wiring the batteries in series would provide 12 volts of output. I attached a picture that shows the way two batteries are typically wired together.
  view full answer...
  
• Availability of a 4-Way Flat Vehicle Connector to a 7-Way Blade Style Trailer Connector
  To go from a 4-Way flat on the tow vehicle to a 7-Way blade style trailer connector, you can use the Adapter 4 Pole to 7 Pole and 4 Pole, # 37185, or any of the connectors from the link below. You would only need to plug the 4-way portion on the adapter into the 4-Way on the vehicle and attach the white ground wire to the vehicle frame. The remaining wires can be taped up and stowed out of the way if not needed. This will give you brake lights, running lights, and turn signals.
  view full answer...
• Trailer Running Lights Do Not Work with Trailer Connected to 2012 Dodge Grand Caravan
  The way you are describing the trailer connectors on the vehicle it does not sound like a factory connector. But regardless of if it is factory or aftermarket, check to make sure there is not a loose white ground wire not connected to anything. The harness will not function fully without a proper ground. It is possible that the lights on the trailer are over drawing the ability of the trailer wiring on the 2012 Dodge Grand Caravan. If it is factory wiring then you would need to consult...
  view full answer...
• How to Wire Two 6-Volt Batteries In Series to Produce 12-Volts of Output
  To wire two 6-volt batteries so that they end up producing 12 volts you need to wire them in series. To do that you need to connect the load to the positive terminal of battery # 1. Connect the negative terminal of battery # 1 to the positive terminal of battery # 2. Ground the negative terminal of battery # 2. I have produced a diagram showing the connections for you.
  view full answer...
  
• Recommendation for Connecting 4-Way Flat to 7-Way Connector on Trailer
  It sounds like you are just needing the Hopkins Adapter 4-Pole to 7-Pole and 4-Pole # 37185. This will plug right into the 4-Way flat on your tow vehicle and provide a 7-Way to connect with your trailer. Since you are only needing to power the lights on the trailer, the additional wires can simply be tied off as they will not be needed. I have attached a short video demonstration on this product that you can also check out.
  view full answer...
• How to Wire 4 12 Volt Batteries to a Motorhome
  There are two different ways that you can attach the four 12 volt batteries to your 1983 Blue Bird Wanderlodge. You can attach them in series or parallel. Attaching the batteries in series will increase your power output. Attaching the batteries in parallel will keep power output the same but increase the capacity. The best way to wire them is all going to depend on how you use them. However, I recommend wiring them in parallel so you do not end up with a 48 volt system that would be difficult...
  view full answer...
  
• Troubleshooting Trailer Brakes Locking Up Until Bumping Brake Pedal Again In Tow Vehicle
  If the trailer brakes are locking up when pressing on the brake pedal in your tow vehicle and not releasing until bumping the pedal again, then it's very possible you have a bad brake light switch on the vehicle that needs to be replaced. It sounds like the switch is sticking when pressing on the pedal. You might check to see if the brake lights on your tow vehicle also stay on until bumping the pedal again, which would be a clear indication of this. If this does not resolve the issue...
  view full answer...
• Troubleshooting Brake Lights and Turn Signals Not Functioning on Trailer
  It sounds like this could just be a simple ground issue that is often encountered when installing something like the Adapter 4 pole to 7 Pole # 37185. I recommend that you make sure that the ground connection on your vehicle is firmly secured to a paint and rust free surface so that you're getting the best possible connection. This would also be a good time to make sure that your existing trailer plug is free from dirt, debris and corrosion, as well. In most cases that will remedy your...
  view full answer...
• Troubleshooting 12V Power Circuit on 7-Way on 2008 Chevy Silverado 2500 Duramax
  Under the hood of your 2008 Chevrolet Silverado there is a connection required for activating the 12V auxiliary power feed on the 7-way. The ring terminal for the 12-volt power lead for the 7-way trailer connector is located to the left of the power distribution box. It is taped to a wire harness under the power brake booster. Cut the tape to release it from the harness. Then run the wire to the front of the power distribution box and hook the ring on the right post. You can refer to the...
  view full answer...
• Troubleshooting a 12 volt Power Circuit on a 2006 Ford E350 Van
  It sounds like a fuse has blown somewhere on that circuit, but since you checked that already you might try checking the back of the 7-way to see if the circuit is connected to the connector properly. There could be corrosion there that is causing the circuit to short out. You might use a circuit tester like our part # 3808 to check for voltage behind the connector and then work your way up the circuit looking for voltage to see where the problem lies and fix as necessary. Since you said...
  view full answer...
  
• 4-Flat to 7-Way Adapter for a 2022 Subaru Forester
  Yes, the Hopkins Adapter 4-Pole to 7-Pole and 4-Pole item # 37185 would be the best choice to add a 7-way vehicle connector to your 2022 Subaru Forester. I have linked an installation video.
  view full answer...
• What are the Two Ways a Battery Bank Can be Wired
  There are two ways you can wire up 2 batteries. One way is in series and the other way is in parallel. In series doubles the voltage but keeps amperage the same whereas in parallel you double the amperage but keep voltage the same. Parallel is the most common way typically.
  view full answer...
  
• Adapter Recommendation to Convert 4-Way of 2015 Ford F-150 to 7-Way
  To convert the 4-way to a 7-way will require the part # 37185. The 4-way would basically just plug into this adapter and you'd have the taillight functions done. If at some point you need to install a brake controller check out the help article I attached on this for more info as well.
  view full answer...
• Troubleshooting 7-Way Trailer Wiring That Engages Trailer Brakes When Headlights Are Turned On
  The issue you describe, your trailer's electric drum brakes engaging when you turn on the headlights on the tow vehicle, is likely to be a simple mis-wiring of the 7-way. If the trailer connector was very old the issue could be caused by internal corrosion in the connector that could be bridging together two different circuits, but with a brand new 7-way the problem is likely to be either a mis-wired 7-way socket on the vehicle or a mis-wired 7-way plug on the trailer. If you refer to...
  view full answer...
• How to Activate Trailer Wiring 12 Volt Power Circuit of 2015 Ford F-150 with 4-Way
  Since you have a 4-way on your 2015 Ford F-150 what you need is the part # 37185 to convert it to a 7-way and then you'll need to tap into the wiring at the rear of the truck frame for the 12 volt power circuit. I attached a picture that shows where you'll find that wire.
  view full answer...
  
• 4-Way to 7-Way Adapter for Truck Towing Trailer with 7-Way
  Sounds like what you need is the part # 37185. This adapter will allow your truck 4-way to plug in and provide you with a 7-way for the trailer to connect to.
  view full answer...
• Can Group 24 and Group 27 batteries be Wired Together in Parallel
  The group number that a battery belongs to refers to its casing size so you can use a group 24 and group 27 battery together.
  view full answer...
• Adding a 4- and 7-Way Trailer Connector to a 2003 Ford F-150 with 4- and 5-Way Connectors
  You won't have to replace all the wiring on your 2003 Ford F-250 to install a 7 and 4-Way connector. All you will need is # 37185. The 4-Way you have will plug into the 37185 (the 4-Way functions are retained). Then ground the white wire to the truck frame. To wire in the remaining wires you will first trace your 4-Way wiring forward under the truck where it plugs into another harness. Inside this harness there will be an orange wire and a blue wire. The orange wire will go to the 37185...
  view full answer...
  
• Where Does the Purple Wire F\or 4- to 7-Way Adapter 37185 Install on a 2010 Ford F-150
  If the trailer coupler has an electric reverse lockout on it then you will need a working reverse light circuit in the trailer connector. You will need to tap into a reverse light wire behind one of the reverse lights on your 2010 Ford F-150. I have linked a video that will help you. The vehicle in the video is different but you can use it as a guide. On the 4 to 7-Way adapter # 37185, the purple wire is for the reverse lights. The blue wire is for electric brake output which you will...
  view full answer...
• Trailer 12V Charge Line and Brake Controller Wire 7-Way Connections for 2016 Ford F-150
  Installing the 4-pole to 7-way adapter part # 37185 that you referenced in your 2016 Ford F-150 requires making the extra circuit connections at the adapter's pigtail leads. These leads provide connection points for the trailer brake controller output (blue wire to blue pigtail), the 12V auxiliary charging circuit (orange wire to black pigtail) and if needed the reverse light wire (which goes to the purple pigtail). The orange 12 volt power wire that is run to the rear frame should already...
  view full answer...
• 4-Way to 7-Way Adapter Recommendation for 2008 Mazda CX-9
  For your 2008 Mazda CX-9 that has a 4-way all you need to convert it to a 7-way is the part # 37185. Since you don't have trailer brakes all you have to do is connect the ground like you mentioned and you'd be set. This will plug right into the 7-way plug you attached a picture of.
  view full answer...
  
• Which Axle of Tandem Axle Trailer Normally Gets Brakes if Only One is Used
  Typically if you are going to put brakes on only one axle of a tandem axle trailer you want to go with the axle that will have more of the weight of the trailer on it. In nearly all cases this will be the front axle but on boat trailer it's pretty common for it to be the rear axle. I attached a help article on adding brakes to an axle for you to check out as well. It will walk you through the entire process.
  view full answer...

Do you have a question about this Trailer Wiring?