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How To Wire In Trailer Tail Light With Additional Red Wire  

Updated 07/18/2024 | Published 07/13/2024

Question:

I broke a taillight cover and was unable to find a replacement. So I got a complete unit, but dont know how to wire it. The old unit had one bulb and white, black and green wires. The new unit has 2 bulbs and an extra red wire to the top bulb. Should I pigtail the red to the black? I assume its a backup light, but unsure

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Trailer Tail Light Base
Trailer Tail Light Base
(click to enlarge)

Expert Reply:

You are correct the 2nd bulb on your new tail light is for a backup bulb. As you do not have this function on your current lighting you should leave it disconnected if you are not going to run a separate wire on your trailer for the reverse function.

expert reply by:
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Bud M

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