Recommended 7-way Wiring Harness for Upgrading Trailer to 7-way by Adding Brakes and Reverse Lights

Updated 08/23/2016 | Published 08/22/2016

Products Featured in This Question

12 Gauge 7 Conductor Jacketed Wire - Per Foot

(515)

$10.80

12 Gauge 2 Conductor Jacketed (Brake) Wire Per Foot

(515)

$3.48

Wiring Kit for Hydrastar Electric Over Hydraulic Actuators

(12)

$88.29

Question:

Im adding brakes to my trailer it only has a 4-pin I need to change to a 7 pin which one should I use / also would I be able to add back up lights on the trailer using the same harness

asked by: Bob S

Expert Reply:

I recommend the # HS381-9000 junction box kit for your trailer. This kit includes a 7-Way trailer connector, a wiring junction box with mounting hardware, 8 ring terminals for 12- to 10-gauge wire, 8 ring terminals for 16- to 14-gauge wire, 10 foot of wire loom, and 1 self-tapping ground screw. You will also need an appropriate length of duplex wire # 12-2-1 to connect your brakes.

The 7-way trailer plug # H20046 included in this kit will have the auxiliary wire that is used for reverse lights, the color yellow. The yellow wire is attached to the center pin on the connector and the center pin in the trailer connector on your tow vehicle is for the reverse lights. Once the vehicle is shifted into reverse, the reverse lights will come on. I have linked the # H20046 wiring diagram to this page for you to better see.

expert reply by: Jackie C