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7-Way to 4-Way Trailer Wiring Adapter for 2015 Mercedes ML350 Towing Trailer with LED Taillights  

Question:

Trailer lights work on 02 F150 but not on 15 ML350 with the 7 pin convert to 4 pin?

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Expert Reply:

Newer German vehicles like your 2015 Mercedes ML350 have a harder time with trailer lighting that is LED as it ends up tricking the vehicle into thinking there's a bulb issue. So the solution is a 7-way to 4-way adapter that has load resistors built in to take care of the problem. For that you'd need just the # C35FR and you'd be set.

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Jameson C
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