What are the Wire Functions on an Optronics 3-Wire Pigtail

Updated 07/27/2015 | Published 07/24/2015

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Trailer Tail Light - Stop, Turn, Tail - Incandescent - Round - Red Lens - Passenger Side

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Hook Probe Circuit Tester

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Question:

my trailer light wiring has a grn wire and a brn wires on the right. it has a tan and yel on the left. The Optronuics 3 plug has a red wire and blk wire plug. the white ground I know. What wire connects to what? light is stop/turn/tail

asked by: Greg

Helpful Expert Reply:

On the Optronics 3-wire plugs the white is ground, red is turn signal/brake lights, and the black is for running lights.

On your trailer green is likely the right turn signal/brake light wire, brown and tan are most likely running lights, and yellow is most likely left turn signal/brake lights.

You will need to use a circuit tester such as # PTW2993 to test the wires on the trailer to confirm.

expert reply by: Michael H