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I have a problem with my trailer light issues on the trucks side. Problem is my right turn signal blinks both left and right signal light. If I turn the left signal on its normal. Problem is the right turn signal only. The 4 flat plug was cut off so I spliced and new one in. Anyone had this issue? Could it be a ground? Thanks
 

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Does this happen only on the trailer or on the vehicle and the trailer? (when it's connected) Did you wire the new one in to the old wires, or go all the way to the tail lights? There is a box behind the left wheel well (under the plastic interior) that converts the vehicle wiring to trailer wiring. Since the turn signals are not the same bulb as the brake lights you need to go through this converter.

Mine went bad and I had to make by own with some diodes.
 
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