Solution for Activating 5th Reverse Light Circuit on Trailer's Wiring

Question

Question:

Hi, Ive a 2016 boat and trailer. The trailer came with reverse lights that I now realized Id really like to work. The trailer has a flat 5 pin connector 4 male 1 female. Both of my Jeeps have the round connectors that I believe are 7pin. 6 tabs 1 middle pin. The middle pin is the reverse 12volt feed as I understand. But in the past year Ive been using a 7pin round to 4 pin flat female connection like the one item im posting about but only having 4 pins And then connecting the flat male 5pin trailer side to the flat 4pin to 7pin jeep side. And then 1 pin just over hung from the 5pin trailer side If youre following me yet... If I buy this, which will then connect to all 5 pins of the trailer connection. Will it bring my trailer reverse lights on? In reverse of course... I do NOT have any trailer brakes. I know the reverse pin is largely used for trailer brake solenoid disengagement. But Im assuming that it ties into the reverse lights of those as well. Im very experienced/versed in electrical. And have wired many waterproofed 12v DC and high voltage AC line voltage leads before. My other idea is.... Im sure itd look cleaner as well but if you guys offer it. Id like to cut off the trailers male flat 5 pin and just wire in a Full 7 pin female round connection so that can just plug straight into my jeeps male 7pin. Because the 7 pin round connections are much more protected and cleaner looking in comparison to the countless flat 4-5 pin connections Ive had that lose their connection continuity with little use due to the easily corroding small round pins. Sorry for the long questions. But I have two as you can see above. Thank you.

asked by: Luke S

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Expert Reply:

The fifth circuit that the Adapter 7 pole to 5 pole part # A75TB carries is the reverse light circuit. So as long as the 7-way on your tow vehicle has this circuit activated the reverse light circuit would then carry over to the trailer's wiring.

Replacing the 5-way on your trailer with a 7-way like the part # H20036 would also be an option worth considering. I don't like to recommend adapters for long term use as it's basically just another wiring connection which is where most wiring problems occur.

expert reply by: Jameson C

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Answer 1

The reverse light pin on a traditional 7-way trailer connector, like part #PK11893 or a factory connector if that's what you have on your 2018 Ram, is the center pin. Take a look at the picture I attached that shows all the pin functions. To…

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Answer 2

There are 2 types of 7-Way vehicle side sockets, both are round, but the difference is the pins. You likely have a blade style 7-Way connector on your 2014 GMC Savana and for a 4- and 5-Way adapter you can use #A75TB. If your 7-Way has round pins and…

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Answer 3

I attached a diagram that shows how most 7-way rounds like the #PK11720 that you referenced will get wired up. As long as you got yours wired up correctly and your trailer taillights and brakes are functioning correctly that's all that should…

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Answer 4

The 5-way flat trailer connector is most commonly found on boat trailers that have hydraulic brakes. The fifth wire is hooked up to the reverse light circuit on the vehicle which then sends a signal to the hydraulic coupler to disengage the trailer…

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Answer 5

You are definitely on the right track. Start off by installing the Tow Ready 4 Pole to 5 Pole Trailer Wiring Adapter #20036 on your tow vehicle with the Blue wire running to your reverse light signal. Once that is done I then recommend cutting off…

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Answer 6

The difference between the Class II and Class III hitches has to do with their Gross Trailer Weight (GTW), their Tongue Weight (TW), and their Hitch Receiver Size. Class II trailer hitch receivers have a 1-1/4 inch receiver and can be rated up to…

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Answer 7

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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Answer 8

In order to determine the torque rating for the lug nuts on your trailer you will need to know check out the chart I attached that shows all of the torque specs for all the trailer lugs available based on stud size, wheel material and wheel size.

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Answer 9

The OEM prep package consists of 4 "pucks" in the bed of the truck that will allow you to drop in puck style hitches for easy installation and removal, that gives you a completely clear bed when not in use. The B&W Companion OEM 5th…

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Answer 10

Lance does have a proprietary plug, but many customers see a standard 6-way or 7-way round and notice it doesn't fit their factory 7-way as well. I've attached an article to help if you have one of the 7-way or 6-way round connectors which we…

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Answer 11

If you just need a 4-pin to 7-pin trailer wiring adapter, then you can use part #C57672. This will plug into the 4-pin trailer connector on your brother's vehicle and give him the 7-pin socket for the trailer. Keep in mind, this will only give…

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Answer 12

As far as wiring for the 2024 Toyota Grand Highlander, we do have the Curt #C59236 available which is more of a universal hardwire harness. Unfortunately there are not any plug-and-play options that have been confirmed to fit as of yet (October 4,…

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