Select Your Vehicle

View Cart



  Contact and Help



What our customers are saying:

Ordered the part on Saturday and had it by Wednesday. $35-$75 cheaper than I could find anywhere else. I plan on using this site again.

Mark

Shalimar, FL

Hopkins Custom Fit Vehicle Wiring
Hopkins Vehicle Organizers

Hopkins Trailer Breakaway Kits
Hopkins Backup Cameras and Alarms

Hopkins Emergency Supplies
Hopkins Winter Weather Supplies


Hopkins





Hopkins Reviews and Installation Videos



See all Hopkins videos
Expert Answers about Hopkins

  • Troubleshooting Trailer Brake Lights not Working When Running Lights are On
  • It sounds like you might have a bad ground connection. When the taillights are on, that is when there is the most power draw on the system. Stepping on the brakes would then add more and this is when a ground problem will usually show up. The taillights usually ground through the mounting bolts on trailers. Check for a bad ground, loose connection, and dirt and corrosion. Any of those can cause this problem. Also check the light bracket connections to the trailer frame as lights can...
    view full answer...

  • Lighting and Wiring Options for Flat-Towing a Jeep Wrangler Behind a Motor Home
  • What you need is a light kit specifically for flat-towing. The Plug-N-Tow TM Vehicle Wiring Harness, # 42615, would be if the Jeep were towing a trailer and not for activating its lights while it is being towed. There are a few options for lighting when flat-towing a vehicle. I have included an FAQ article that covers the various options. What it boils down to is how often you will be towing the Jeep behind the motor home. If you do not plan on towing it very often, the best way to...
    view full answer...

  • How to Wire Two Batteries In Parallel on an RV Trailer
  • When connecting two batteries together on an RV trailer you usually connect the batteries in parallel to draw 12 volts from both of the batteries. We have a photo, see photo at right, that shows how to wire the batteries in parallel. Once you have the batteries wired properly in parallel you will need to connect the 12 volt power wire from the trailer 7-Way connector to the positive wire on the first battery. This connection will help maintain the batteries when the vehicle is running,...
    view full answer...

  • Trailer Lights Go Out when Brakes are Applied
  • What you describe is a ground problem with the trailer wiring. Starting at the rear of the vehicle, confirm that the ground connection on the Plug and Tow Harness is securely fastened to bare metal. If there is undercoating, corrosion, or grime built up under where you attached the ground, you will not have a good connection. Next, examine the point on the trailer where the trailer connector ground wire attaches. This can usually be found on the trailer tongue. Make sure the wire is in...
    view full answer...

  • How to Release the Brakes on a Trailer Once the Break Away Switch Is Activated
  • If you still have the plunger end that goes in the break away switch, then you can simply insert the plunger back into the switch and that should cut off the power to the brakes on your trailer. If you no longer have the plunger, then you can either remove the break away battery or cut one of the wires going to or from the break away switch. One wire is coming from the break away battery and the other is going to the brake circuit on the trailer. Cutting one of those wires will terminate...
    view full answer...

  • What Back-Up Camera Can be Used with a 32 Foot Travel Trailer
  • At that trailer length, we have two wireless cameras that will work for you. The first is the Swift Hitch Camera, part # 04928. It will transmit up to 300 ft. with no obstructions. I would mount it towards the top of the trailer to get better signal transmission. The camera and monitor have built-in batteries and the kit includes a charger that will charge both from your cigarette lighter port. You could also use the Master Lock Back-Up Camera, part # 4843DAT. It transmits up to 125...
    view full answer...

  • Replacing 6-Way on Trailer With 7-Way Connector
  • Since wire color codes are NOT universal, we always recommend wiring by function, rather than wire color. If you look at the Trailer Wiring FAQ article I have linked you to, you can see some diagrams showing the proper way to wire a vehicle and trailer side 7-way trailer connector. If can you open up the existing 6-way connector on your trailer, take the housing apart and look at the terminals the wires attach to. In many cases, they will be labeled like what is shown in the FAQ article....
    view full answer...

  • Stop and Turn Signals Work But Tail Lights Do Not Work on Trailer
  • The first thing I would check is the trailer wiring running light fuse located in the power distribution box under the hood. Once the fuse box is located check the legend on the lid to determine the correct fuse to check. Blown running light fuses are a common problem with the Nissan Titan trucks. If the running light fuse is not blown or missing, you should also check fuses in the cab of the truck. Again use the legend on the cover, you will have a fuse box on the passengers side and...
    view full answer...

  • How to Wire 12V Battery in Enclosed Trailer to Power Trailer Lights Independent of 7-Way Connection
  • You are correct in your description of how to wire in a new auxiliary battery in your enclosed trailer. You will take the 7-Way's 12V power feed and route this to the positive terminal on the auxiliary battery, and you will ground the second battery to the trailer frame, as you described. You might refer to the linked article on trailer wiring to see the usual wiring configurations on trailer connectors. If you want to protect your vehicle battery from accidental discharge (such as if...
    view full answer...

  • Using a Multimeter to Troubleshoot Electric Drum Trailer Brake Magnets
  • I would check the magnets for wear before going on to test them with a meter. If the magnets show abnormal wear or if you can see the windings beginning to show through the friction surface of the magnet then they will need to be replaced. To further test your magnets, first make sure the trailer is not connected when performing this test. If the trailer is connected, you run the risk of shorting out the brake controller or various other electrical components. I attached an FAQ article...
    view full answer...

  • Using a 6-Way to 7-Way Adapter for a RV with 6-Way Round Socket and Trailer with a 7-way Connector
  • The Hopkins 6 Pole to 7 Pole Adapter, # 47435, does have a pin for the brake output for a brake controller. This adapter will work for your set up as long as the center pin of the 6-way plug on your RV is for 12v power and the pin in the 10 o clock position is for the brakes. You can verify this using a circuit tester like part # 3808. If the center pin on your 6-way plug is wired for brakes and the pin in the 10 o clock position is for 12v power, then you can still make an adapter using...
    view full answer...

  • Adding a Battery and Wiring to a Non-Powered Trailer to Add Interior Lights to an Enclosed Trailer
  • The first thing you will need is a battery and a battery box. The wiring for the light will need to be connected directly to this battery via a switch that you can get at a hardware store if the light does not already have a switch. Or you can install a new light that has a switch like the Trailer Dome Light with Switch and Aluminum Base, # IL61CB. Mount the switch in the trailer, route the wiring from the light to the switch, and then from the switch to the battery. If the light is...
    view full answer...

  • Wiring For 7-Way Connector on 2004 Chevrolet Silverado 2500
  • On your 2004 Chevrolet Silverado 2500 the factory wires should be light green, dark green, blue, yellow, red, brown, and black. The functions of those wires should be as follows: light green - reverse lights dark green - right turn/brake blue - electric trailer brakes yellow - left turn/brake red - 12 volt power brown - running lights black - ground I would also recommend to test the functions of your wires with a circuit tester like the Quickee Tester, part # 3808, to verify...
    view full answer...

  • Which Trailer Wiring Connector Has a Pin for Reverse Lights
  • In order to add reverse lights to a trailer would would need to have a 7-Way on the trailer, like # 50-67-008, and a 7-Way on the vehicle. On the vehicle side, if you are looking at the back of the 7-Way where the wires connect, the reverse light circuit is the center pin. It will need to connect to a reverse light wire behind one of the vehicle tail lights. On the trailer side the matching pin is again the center pin. So from that pin, you would route wire to reverse lights. Reverse...
    view full answer...

  • Can a 7-Way Trailer Connector Be Used To Charge the Trailer Battery
  • The 12 Volt auxiliary terminal on your 7-way connector can be used to keep the battery on your trailer charged. You will need to run a 10 gauge power wire like # 10-1-1 from the 12 volt auxiliary terminal on the 7-Way trailer connector on the trailer to the positive terminal on the trailer battery and ground the negative terminal of the trailer battery to the trailer frame. This will allow you to maintain a charge on your trailer battery, it will not charge the battery from a discharged...
    view full answer...

  • Explanation of How Trailer Breakaway Kit Works
  • The Hopkins Brake Master Break-Away Kit works by applying 12 volts of power to the trailer brakes when the plastic key is pulled out of the switch box allowing the circuit to be completed and power applied from the breakaway battery. If the trailer coupler should come off of the trailer ball, the safety cable pulls the key out and the connection is made to stop the trailer. The included rechargeable battery is charged by the auxiliary power wire from the tow vehicle which must be connected...
    view full answer...

  • Trailer Brake and Turn Signals are Not Working but Running Lights Work
  • If you are using an adapter like # 37385, it could be that the adapter is not pinned out the same way as your trailer requires. What you can do is test the functions on the trailer connector on your vehicle with a circuit tester like # 3808 if needed to make sure that all of them are working properly. If they are then you know the problem is behind the vehicle side connector. If they are not working properly on the tow vehicle it could still be a blown fuse or relays that needs to be...
    view full answer...

  • Towing Trailer Using a 7-way RV Connector With a Semi Tractor with 7-way Round Pin Connector
  • To tow a trailer that uses a RV style 7-way blade-style trailer connector with semi that has a 7-pin connector, you will need to construct an adapter that also combines 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 # PK12707. The converter would be wired in between both sockets to combine the brake light...
    view full answer...

  • Trailer Turn Signals and Brake Lights Not Working on a Boat Trailer
  • If you are getting the correct signals from the truck side trailer connectors then the problem is on the trailer. There could be a number of issues causing the problem. The easiest to check would be the trailer side connector. With the trailer connected, test the wires right behind the trailer side connector using a circuit tester like # 3808. If no signals are coming through then you know the connector is bad and it will need to be replaced. While you are at the trailer side connector,...
    view full answer...

  • How to Set Up a Hopkins Agility Brake Controller Part # HM47294
  • The proper settings are determined by a host of variables including trailer weight, size of trailer brakes, vehicle weight, size of vehicle brakes, and cargo inside vehicle. You can get started by following the Setting Your Controller portion of the directions. If you do not have a copy of the directions, I have added a link to them below. In order to set up your brake controller, you need to connect the loaded trailer to the vehicle, and drive to a large open area, like an empty parking...
    view full answer...

  • Recommendation for a 4-Way Flat to 5-Way Flat Trailer Connector Adapter
  • The Lexus 300 and Nissan Pathfinder use different wiring harnesses, but if they both have 4-Way flat trailer connectors, they will be pinned the same (function the same). The 5-Way trailer side connector will have an extra function at the pin furthest from the covered ground pin. This function is typically used on surge couplers that have an electric lockout feature. The corresponding pin on the vehicle side would need to be connected to the reverse light circuit for this feature to function....
    view full answer...

  • 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...
    view full answer...

  • Powering Trailer Mounted Winch from 7-Way Trailer Connector
  • The wiring that feeds the 12-volt accessory circuit on the 7-way trailer connector is of insufficient gauge to allow enough power to pass through to run a trailer mounted winch. The main function of that circuit would be for lighter-duty applications, such as providing power for interior trailer lights or to maintain a trailer mounted battery. To provide power for your trailer mounted winch, you can either install a battery on the trailer to power it, or use a quick disconnect like...
    view full answer...

  • Troubleshooting Brake Controller Not Working When Brakes Are Applied but Works With Override Switch
  • This sounds like the trailer brakes are not receiving the signal from the brake controller when you apply the brakes. I believe what is happening is that you may have a loose, broken, or inaccurate connection on the red wire from the brake controller. The red wire needs to attach to the stop light switch above the brake pedal. It connects to the wire on this switch that carries a signal ONLY when the brake pedal is pressed. It should not have a signal at any other time. Use a circuit...
    view full answer...

  • Is the OEM Trailer Wiring Pattern the Same for Dodge Ford and GM vehicles
  • The OEM wiring configuration of all Chevrolet, Dodge and Ford vehicles, as well as Nissan and Toyota, is the same, and is identical to the pattern shown in the photo I have attached. This is all based on wiring that has not been changed from the original configuration by the owner of the vehicle. Many times we see vehicles come in with the wiring on the vehicle changed because the person has a trailer that is wired incorrectly. Instead of changing the trailer wiring to match the industry...
    view full answer...

  • Charging a Trailer Breakaway System Battery Using the 12 Volt Circuit on a 7-Way Connector
  • To charge the battery in the Engager Trailer BreakAway Kit, # 20099, you can attach the wire from the 12 volt circuit on the trailer side 7-Way (1 oclock position on the back of the trailer side 7-Way where the wires attach) to the input wire on the trailer breakaway system. This system has a charger built in to it. As long as it is connected to a function 12 volt circuit it will charge the battery. When connected to the towing vehicle and the vehicle on and/or running, the 12 volt circuit...
    view full answer...

  • How to Make a 6-Way Square to 4-Way Flat Trailer Wiring Adapter
  • The 6-Way square trailer connector is not used by a lot of trailer manufacturers. A lot of Jayco trailers may have them but mostly you come across the 4-Way flat, like what you have on your trailer, and the 7-Way blade for RV applications. What I recommend is to convert the 6-Pole on the Monaco to a 4-Way. You can do this very easily by removing the 6-Way plug, and then testing the wires for function using a circuit tester like # 3808 if needed before installing them in a new 4-Way,...
    view full answer...

  • ITBC on 2012 GMC Sierra Malfunctioning when Used on Some Trailers
  • I think you might be on the right track thinking that your ITBC is picking up on ground problems that an aftermarket brake controller would not. In my research, I found posts on several different forums indicating that the ITBCs are indeed very sensitive to any excess resistance. I found a few folks who recommend starting your tow vehicle, THEN plugging the trailer in. Apparently in some cases, this will help. As far as your ITBC being faulty, I can tell you that on the earlier ITBC...
    view full answer...

  • Running Lights Work But Brake Lights and Turn Signals Do Not Work on Coleman Camper
  • The best way to start troubleshooting your truck and trailer is to disconnect the two and test each one separately. If you have access to a different tow vehicle or trailer you can test using one of these to isolate the problem to either your truck or camper. Inspect both the vehicle and trailer connectors for signs of dirt, discoloration or corrosion. Even very slight greenish or whitish discoloration on the connectors can interfere with signal transmission. You can try cleaning the...
    view full answer...

  • How to Install 4-Way Trailer Connector on 1999 Chevrolet Silverado 1500 with Factory Tow Package
  • The Tow Ready T-One Wiring Harness, part # 118315, is for the 1988 to 2000 Chevrolet C/K Series trucks. It is not for the 1999 Chevrolet Silverado 1500. The 1999 Chevrolet Silverado 1500 would use either the Tow Ready Wiring Harness, part # 118384, which is used if you have a harness that is located under the vehicle, behind the bumper, on the driver’s side of the vehicle. The wiring harness # 118384, is meant to plug in line with the factory wiring and provide a 4-Way flat connection....
    view full answer...








Stay Connected


Subscribe to email newsletter

Email  

privacy - we don't send unsolicited email






etrailer.com reviews etrailer.com reviews

All images, layout and content copyright etrailer.com