Installing 4-Pole/7-Way Trailer Connector on Newmar Motorhome

Question

Question:

I recently bought a Newmar motorhome which came with a 7 pin flat plug. I have a car dolly, also with a 7 pin flat plug. I also bought magnetic tow lights to put on the trunk of the towed vehicle. These have a 4 pin plug. How do I attach both. Is there an adapter that retains the 7 pin plug and adds a 4 pin plug, so I can use both?

asked by: Bob

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Expert Reply:

There is not an off-the-shelf adapter that would convert your existing 7-way flat blade to a 7-way and 4-pole, but there are some fairly easy options for adding a 4-pole.

You can access the wiring harness leading to the existing 7-way, and tap in a 4-pole harness like part # 18252, which would allow you to use both harnesses simultaneously. The connector includes a circuit tester which would help identify which circuit serves which lighting function.

Another option would be to completely remove your existing 7-way and install a 7-way/4-pole connector like part # HM48470. If you take a look at our wiring FAQ article, you can see how a 7-way is wired. Be sure to wire by function using a circuit tester rather than wire color.

I have linked you to an install video that will help you through the install process. Keep in mind that you will want to use a tester to verify the function of the wires on the RV.

expert reply by: Mike L

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Answer 1

Did you mean to say that your motorhome was built on the F550 chassis? According to the literature I found online, that's the chassis that Newmar built the 2016 Baystar Sport 2903 on. If that's the case, you've likely missing…

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Answer 2

I will be happy to help you out. The separate brake light circuit is going to have to be combined with the turn signals in order to use a light kit with a 4-Pole connector. There is a special converter for this, #RM-732. On the input side you will…

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Answer 3

For your 2016 Newmar Ventana with the Freightliner XC chassis, the Prodigy P3 #90195 you asked from is an excellent choice with easy to use features and no codes to decipher. Because you have the 7-way if it came from the factory you would simply…

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Answer 4

To check the pins on the vehicle side 7-Way, you can use a circuit tester or the volt meter. The circuit tester will show you if a signal is coming through on the pin you are testing while the volt meter will tell you that and how much voltage is…

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Answer 5

Yes, there is indeed a Demco tabless base plate that fits your 2021 Ford F-150, and I verified this fit with Demco for you. This is a really nice choice for your truck because these are the least obtrusive installation, bolting right into where your…

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Answer 6

To flat tow your 2022 Ford Maverick you'll need a tow bar, base plate, tow bar wiring kit, braking system, and safety cables. I have the following recommendations for each of these items: Tow Bar: The Roadmaster Falcon All Terrain, Non-Binding…

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Answer 7

First, clean the connector #C94FR the best you can. Then you can go ahead and push them together as hard as you can. That will release some of the tension on the little tab. Then it may be a little easier to push in the tab and pull apart. If this…

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Answer 8

The Curt Vehicle Wiring Harness #C94FR that you referenced is supposed to be used if your 2019 GMC Terrain came with the factory tow package. If those fuse locations are empty, then it sounds like you don't have the factory tow package. As of…

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Answer 9

The best way you can determine if your 2021 Ford F-150 has LED or Incandescent lights is to call the dealer with your VIN number and they should be able to tell you. If your vehicle has LED lights, you can use the Roadmaster Universal Wiring Kit with…

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Answer 10

To flat tow you need a tow bar, safety cables, base plate kit, braking system, wiring harness as well as a few other smaller miscellaneous items. The Roadmaster Nighthawk All Terrain, Non-Binding Tow Bar for Blue Ox Base Plates, #RM-677 (safety…

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Answer 11

The difference between the Direct-Connect #RM38VR and Crossbar-Style #RM58VR that fit your 2021 Ford F-150 is the type of tow bar that they accept, and the ease of connection. The direct-connect base plates allows you to simply connect your tow bar…

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Answer 12

A 4-Way trailer connector has the basic lighting functions only; running lights, left turn signal and brake lights, right turn signal and brake lights, and ground. A 7-Way has these functions and a 12 volt circuit, a circuit for electric trailer…

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Installing 4-Pole/7-Way Trailer Connector on Newmar Motorhome

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