Select Your Vehicle

View Cart

Hopkins 7 Pole to 4 Pole Adapter with Tester Review

content loading

Best Wiring

Customers compare 47345 to these similar products

Products Featured in this Video

Review of the Hopkins 7 Pole to 4 Pole Adapter with Tester

Today we are going to take a look at the 7-pole to 4-pole adapter with tester and cover from Hopkins, part number 47345. Our Hopkins adapter takes our 7-pole end on our vehicle, and converts it down to a 4-pole end for our trailer. There is also a series of three LEDs that will let us verify the function of our trailer system on our vehicle. :21

We will plug this into the vehicle and check using the LEDs to make sure the system on the vehicle is ready. Then we can plug in the 4-way on our trailer. Tail light, brake, left blinker, and right blinker. So we know the 4-way function is working properly with our vehicle, and we are ready to plug in our trailer. And we will be set to go. That does it for our Hopkins 7-pole to 4-pole adapter with tester and cover, part number 47345.

Info for this part was:

Video Edited:
Andrew K

At we provide the best information available about the products we sell. We take the quality of our information seriously so that you can get the right part the first time. Let us know if anything is missing or if you have any questions.

Wiring Videos

This Old Trailer: Repairing a Trailer Light Wiring Problem

Today on This Old Trailer, we are going to fix some lighting problems. Now what is happening on this trailer is that one side of the taillights is not working at all and the passenger side sometimes works and sometimes does not. So the first thing we need to do is go ahead and check to make sure we have power going all of the way back. That means we will start from the front and check our way on to the back. The first thing we need to do is go ahead and apply power. We are going to start checking our power from the plug on back. What we are going to do is actually take out the screw that holds the connector together. We are going to push it inside then we are going to pull it apart. Then we can see the contacts on the inside. We are going to turn on the running lights and we are going to hit the brakes for the taillights themselves. So, we should have three wires hot. We will go ahead and check that. It looks like we have power for a second here and it went away. We will try the other two. It looks like the same thing. So it looks like we are dealing with some multiple shorts. So we know it is something definitely on the trailer at this point. So we will go ahead and go back to the taillight and start doing a visual inspection. 0:57

This Old Trailer : Replacing a 7-Pole Connector

Today on This Old Trailer we are going to diagnose some wiring problems. The problem with this trailer is that when you plug the trailer into the vehicle none of the lights work. It could be a variety of problems but the first thing we are going to do is start from the front and work our way back. Just to make sure there is nothing wrong with the towing vehicle use an independent power source to power up the trailer just to make sure. Then we will turn on the lights and check in the back. We have got our power supply on and it looks like there is nothing working in the back and also it looks like the running lights were not working either. Lets go back up to the front and check the connector. 00:33

This Old Trailer: Replacing a 6-Pole Connector

Today on This Old Gooseneck Trailer we are going to install part number PK11604 from Pollak. This is their 6-pole connector and we are going to replace the one that is originally on this trailer right now. Now, what has happened to this one is it has been basically pulled apart a few times and basically the insides are getting worn out and some of the screws a striped out. So, we are just going to go through it and replace it. The first thing we want to do is go ahead and take out this screw and this screw here. This little screw right here, this is kind of a clamp that holds the cable in place. Then this little set screw holds the inside in place and in alignment. OK, let us push that on out. Now, when you go ahead and take these wires apart, note which wires go to what. On the inside of the connector they are all labeled left turn, right turn, TM for trailer marker lights, S is for stop which will be for brakes typically and you have the A in the middle for auxiliary for whatever you want to use and then you have GD for ground. 0:55

Testing for a Correct Ground Connection Demonstration

Today we are going to show you a little bit on wiring. Basically, a wiring 101 or what to look for when you hardwire into a vehicle. Hardwire means actually getting to the wires and splicing into them and making a connection. The first thing you want to do when you hardwire a vehicle is you want to make sure you are grounded and get a test. Make sure your tester is working fine. On some cars you will see this on one of the wires. Being the same color like these black wires. You will see a lot of them ran to a screw inside the body here. Chances are that is going to be your ground. You can actually use that ground for your light tester. What we mean by a light tester is a device like this right here. Basically, this connects to the ground and what this device does is this hooks around the wire you want to test and you push it together and it precises the wire and touches the copper wire inside, creates a circuit and lights up when you have power in that wire.

Circuit Testing for Vehicle Wiring

Today we are going to show you a little bit of wiring. Basically, like a wiring 101 and what to look for when you are going to hardwire into a vehicle. And what hardwire means is actually getting to the wires and splicing into them making a connection. We will go ahead and do our test and ground it. Instead of piercing the wires, if you have a junction that is easy to get to go ahead and pull it apart. And instead of piercing the wire, go ahead and test on the inside here. Just check each individual contact here until you hit something. Then make sure you actually have your running lights on and then go ahead and turn them back off. It also proves to us that our ground is good and it is working with our electrical system here.

5 Wire vs 4 Wire System Demonstration

To tell if your vehicle has a 4 or 5 wire system what you want to do is have a friend go ahead and step on the brakes. And note which lights come on. Now what you want to do then is go ahead and turn on the turn signal while holding the brake down and turn on the right turn signal. As you an see you have your brake lights on and you see the amber turn signal going on to let you know you have a 5 wire system. Now on this vehicle here we have a 4 wire system. The way to double check that is go ahead and turn on one of the turn signals like the right one here. Note which bulb is burning and which filament on the inside and turn that off. Then go ahead and hit your brakes. And you notice here, it is one in the same. So that means your turn signal and your brake lights are one in the same and you just use a regular 4 wire system you do not need a converter.

Stay Connected

Subscribe to email newsletter


privacy - we don't send unsolicited email reviews reviews

All images, layout and content copyright