No Power to Interior Cargo Lights on Trailer with 2020 Ford F-250

Question

Question:

The interior lights do not light up in my cargo trailer when hitched to my 2020 Ford F-250 Super Duty. Ford Dealer is saying the truck senses there is no battery in the trailer so it doesnt send power to it. We have friends who have all hooked up to it Dodge, 2021 Ford F-150 and the lights in the trailer work. All Fuses have are working. HELP!

asked by: Chris M

1

Helpful Expert Reply:

The Ford Smart Tow System on the 2020 Ford F-250 won't send power to the battery charge line circuit until the vehicle is in motion and gear shifting. I am not aware of any way to change the setting for this. Therefore, your only options to use the interior lights in the trailer would be to either install an on-board battery or direct wire a battery charge line circuit from the truck battery to the trailer connector using part # DW02508-1 and part # 9510.

expert reply by: Conner L

1

Answer 1

The only way you could power interior dome lights on a trailer without it being connected to a tow vehicle would be to power the lights with a battery like a breakaway battery. How you choose to wire up the batteries will in the end be up to you, but…

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Answer 2

The exterior lights on your trailer - stop, turn and tail - and the interior lights will usually be fed by different power sources. On an RV-style 7-way the stop/turn light signals are carried on the pins at the 3-o-clock and 9-o-clock positions and…

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Answer 3

The interior lights of your enclosed trailer are likely connected to the 12V (Auxiliary) power pin on the 7-Way of your trailer. You can verify this by applying 12V power from a separate battery to this pin and seeing if that supplies power to your…

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Answer 4

There are traditional and standard wiring configurations and that can be frustrating when working with electrical connectors. We try to always remind customers to check wiring for function and not to rely on the color of the wires for that reason.…

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Answer 5

When it comes to running the lights in your trailer without having to hook to the 7-way on your truck, I recommend using some 10 gauge wire to add a car battery to your trailer for power. You'll just need a few supplies in addition to a battery;…

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Answer 6

Yes, you would be able to install a battery on your horse trailer, and power the lights when the trailer is not connected to the truck. What you will want to do is run the power wire, typically the Black wire, on the trailer connector and connect it…

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Answer 7

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 8

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 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

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 11

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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