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Rewiring Boat Trailer for 7-Way to Use LED Lights


I would like to rewire my boat trailer with LED lights and include back up lights so I can see the ramp better. My truck has the tow package and I have a 7 pin connector on my truck. Is there a wiring package with a 7 pin connector that I can use to install the LED and backup lights on my trailer? Thank you.


Helpful Expert Reply:

There are a number of things you will need if you want to re-wire your boat trailer to use LED lights and you should start with the Epicord 7-Way Molded Trailer Plug with Junction Box # 277-000141. Keep in mind you will also need Ring Terminals # 44-5310A and Loom Clamps # A0500

The box is color coded like this:

- White (ground): 10 gauge
- Black (12V power): 10 gauge
- Yellow (reverse/auxiliary): 14 gauge
- Red (left turn and stop): 14 gauge
- Green (tail and running lights): 14 gauge
- Brown (right turn and stop): 14 gauge
- Blue (brake): 12 gauge

For LED lights I highly recommend checking out the LED Trailer Tail Light # STL57RB (Driver's side) and # STL56RB (Passenger's side). These are submersible lights with a total of 40 diodes and have mounting holes that are 2" center to center, which is standard for trailers.

Then for back-up lights I strongly recommend the 22 diode GloLight LED Backup Light # BUL111CB which are surface mount but can be recessed mount with Grommet # A70GB. They do require a 2-prong pigtail # A45CB or # A49PB for a right-angle pigtail. You can see from the accompanying photo an example of these lights in action.

For clearance lights a great option is the Optronics LED Clearance or Side Marker Light # MCL95RB (Red) or # MCL95AB (Amber) because they are waterproof lights that are easy to install because they use a single wire and ground through the mounting hardware.

I've added links to video reviews for you to look at and also linked a help article on trailer wiring which is a great source of information.

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helpful expert reply by:
Kyle S

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The trailer is for a 16ft boat, so pretty small. Do I have to use the Junction Box or can a wire directly to a 7 pin connector? thx

asked by: Eric V


Helpful Expert Reply:

You do not have to use a junction box but that's often easier; however, can wire it to your 7-pin like the 7-Way Molded Trailer Wire Connector # H20043.

This connector uses this wiring code:

- White Wire: Ground
- Red Wire: Left Turn and Brake
- Brown Wire: Right Turn and Brake
- Green Wire: Tail Lights
- Blue Wire: Brake Power
- Black Wire: 12 volt (hot lead)
- Yellow Wire: Aux.

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helpful expert reply by: Kyle S
Kyle S

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