How to Wire the GloLight LED Trailer Tail Light Part # STL178RB to a Trailer Connector

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Question:

First, thanks for all of the good info that you provided. I have three more things and that should be it for me. For the Hopkins Quick-Lock Diode part # HM56306 , you said that I would need two of them. I am wiring just one STL178RB light to have both stop/turn signals work with it. Couldnt the two stop/turn signal wires from the trailer connector harness go into the two Hopkins diode inputs and have the one output go to just the one light? The light only has one stop/turn wire. Would that work or would I still need two Hopkins diodes? Do you have the dimensions of the Roadmaster Single Park Light Diode part # RM-690? I couldnt find it on the part page. For the Ram LED Lighted Trailer Hitch Cover part # RP86531, there is a foaminch thing that goes around where it attaches to the hitch. I had one of those foaminch things for a novelty hitch item that I had before and it helps keep water out of the hitch and with vibration. Can that be purchased separately?

asked by: John

1

Helpful Expert Reply:

The white wire on the back of the GloLight LED Trailer Tail Light part # STL178RB is for the ground. If you were wiring it to a trailer connector like part # HMC20031 then you would just need to make sure that it is attached to the ground terminal and no additional grounds would be needed. The outer ring of the light that you are referring to is made of plastic just like the body of the light is. The wire leads are around 6" long.

I have attached a review video for you.

expert reply by: Conner L

1

click to enlarge

John

9/18/2018

The white wire on the back of the GloLight LED Trailer Tail Light part # STL178RB is for the ground. If you were wiring it to a trailer connector like part # HMC20031 then you would just need to make sure that it is attached to the ground terminal and no additional grounds would be needed. The outer ring of the light that you are referring to is made of plastic just like the body of the light is. The wire leads are around 6" long. I have attached a review video for you.

Conner L.

9/18/2018

In order to have the GloLight LED Trailer Tail Light part # STL178RB illuminate for both the right and left hand turn signals in addition to the brake lights you would need to install a 4-way like the Wesbar 4-Pole Flat Connector part # W787264 on the light in addition to two single diodes like part # RM-690. The diode would be needed so that the right and left hand turn signals do not backfeed into the vehicle wiring as you mentioned. I have attached a diagram which shows you how the light will need to be wired. If you don't want the light to illuminate with the brake lights then a converter box like part # 118158 would also be needed.

John

9/19/2018

I have a couple additional questions. Your picture shows two RM-690s. They look small in your picture, but look much bigger in itsfoot actual pictures. This would be problem with the STL178RB light being so close to the hitch. Is there something smaller that can be used? How about the Hopkins Quick-Lock Diode HM56306 where both turn signals wires coming from the trailer hitch harness connector being used as input and the one output going to the light? Also, there is a box used in the Ram LED Lighted Trailer Hitch Cover RP86531. Is something like that available? Is there a way to tell if the diode is actually working? Thanks!

Conner L.

9/19/2018

The Hopkins Quick-Lock Diode part # HM56306 can indeed be used in place of the Roadmaster Single Park Light Diode part # RM-690. The Hopkins diode measures 1-3/4" long x 3/4" wide. There is only one output on the Hopkins diode so you would need to use one for each turn signal wire. The electrical box on the Ram LED Lighted Trailer Hitch Cover part # RP86531 is not offered separately though I am sure you could modify this unit to work with your light. In order to test a diode you would need a multimeter like part # PT89ZR with a resistance mode.

See All (5) Replies to John ∨

Answer 1

Hey Joe. The GloLight LED Trailer Light w/ Flange item #STL178RB is sold individually. This submersible LED light has brake, tail, and turn signal functions. It measures 7-1/2" wide x 3-5/16" tall x 1-1/8" thick and extends out…

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Answer 2

For the GloLight LED Trailer Tail Light #STL178RB that you referenced the white wire is the ground wire, the red wire is the stop/turn signal wire and the black wire is the taillight/running light circuit.

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Answer 3

For Trailer Light Mounting Bracket #BK70BB you would use light #STL111RB with grommet #a70gb and wiring pigtail #A47PB. I have included links to videos of all three of these parts for you. Light #STL178RB would not fit in the mounting bracket since…

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Answer 4

It is not recommended to mix LEDs with incandescent lights on a trailer. The problem is the amount of power required by each type. LEDs require much less power than incandescents. If one of each where on the same circuit, the draw from the…

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Answer 5

Hey Peter! If you can find an LED compatible 2057 bulb then yes you can replace it but we do not have one so sorry I can not help you there. As far as adding a resistor goes, maybe? You may not need load resistors when you switch to LED bulbs. The…

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Answer 6

It's not common for hyper-flash to occur on a trailer but this comes down to which trailer wiring harness is installed on the tow vehicle. If you are tied into the vehicles tail light circuits as opposed to a tow package port then hyper-flash is…

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Answer 7

You may not even need load resistors to switch to LED lights. The best thing to do is to try the lights without load resistors first. No need to purchase something you may not need until you know need it. Load resistors such as #DI34ZR dissipate heat…

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Answer 8

The part #STL178RB you have now can also be used as just a stop and running light assembly. All that matters is the way it's wired since you are wanting to use it only as a stop and tail. So for that you'd need the #118158 to separate out the…

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Answer 9

If your current lights with a rubber flange are ineffective, the GloLight LED Trailer Tail Light - Stop, Tail, Turn #STL178RB would be a good option as a replacement as long as the dimensions of 7-1/2" wide x 3-5/16" tall x 1-1/8" work…

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Answer 10

When the running light circuit is activated all diodes of the #STL78RB would activate. When the brake lights or blinkers are applied the outside diodes get brighter. To see the difference check out the review video I attached. The GloLight part…

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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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Answer 12

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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How to Wire the GloLight LED Trailer Tail Light Part # STL178RB to a Trailer Connector

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