Recommended Tail Lights For 4" Round Hole on Stock Trailer

Question

Question:

I need to find a replacement round light to fit in a 4” wide hole on my stock trailer. Would be great to filter on hole size instead of light size.

asked by: Matthew J

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Expert Reply:

With having a 4" round hole I recommend using the LED Trailer Tail Light # STL13RFHXB. This light is 5-5/8" round and will mount over the 4" hole you have. It includes wiring for the running lights as well as turn/brake signals. The recessed lights like the GloLight # STL101RKB are designed to fit the more commonly used 4-1/2" hole.

expert reply by: Bud M

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Answer 1

The Light, Red Flush Mounted Sealed Turn Signal - Round #435800 will require holes that are 4-1/2 inches diameter for the grommet to fit properly. I measured this in our warehouse to confirm and have attached a photo to help.

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Answer 2

The 4-1/4-inch measurement provided for the Peterson Red Flush Mounted Sealed Turn Signal #435800 refers to the diameter of the light itself, not of the mounting grommet that is included. The outer diameter of the grommet is 5-1/2-inches.

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Answer 3

I have a solution for you, but the 4-3/8" Round Trailer Tail Light #ST24RB that you referenced is not submersible. The closest thing we have to what you referenced that is submersible would be the Red Flush Mounted Sealed Turn Signal #435800.

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Answer 4

The first and easiest thing you should check is that the trailer is being towed level. If the trailer is nose high or low that can cause the equalizers to not sit level. You will need to select the correct rise/drop ball mount so that the trailer…

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Answer 5

The closest option we have available to your existing round Glo-Brite assemblies (which are no longer made) is the Optronics LED Trailer Tail Light #STL13RFHXB. This assembly has an overall diameter of 5-5/8" and the light face itself measures…

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Answer 6

A light kit like the Optronics Trailer Light Kit, part #TL29BK, for your trailer is a fairly simple installation if you have average mechanical abilities. I am including a link to a video of the light kit being installed on a trailer and another…

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Answer 7

From what I could find it looks like your 122R (red) and 122Y (amber) lights measure 3.75" x 1.70" x .81". We don't have any replacement lense directly for the GLO-BRITE lights but we do have some similar lights that you could use…

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Answer 8

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 9

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 10

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 11

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…

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