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What are the Functions of the Red and Black Wires on the Optronics Trailer Light # STL89RCB  

Updated 09/29/2014 | Published 09/28/2014

Question:

which wire is for running lights and which wire is for brake lights?

1

Helpful Expert Reply:

On the Optronics Trailer Light # STL89RCB the black wire is for the running light circuit and the red wire is for the brake light/turn signal circuit.

Check out the review video I attached for this product as well.

expert reply by:
1
Jameson C

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