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Combined Trailer Turn Signal and Side Marker Running Light for a Trailer with no Side Markers  

Question:

Id like to add a side marker light to a long trailer I have that currently has no side markers. But Id like a dual circuit, so its on with headlights as a marker but has a blinker capability as well.

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Expert Reply:

On a trailer, the turn signals and brake lights are combined. So if you where to wire in a side marker light but also wanted to have it light up with the running lights, it would end up lighting up with the brakes as well.

You can use the Optronics light, # STL90A24B, for this purpose. The White wire would ground to the trailer frame, the red wire would connect to the trailer wire carrying the turn and brake lights. The last wire would connect to the running light circuit.

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Michael H

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