7-pin to 4-pin trailer wiring adapter issues
10-16-2014, 12:50 PM
#1
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C300 4Matic Sport
7-pin to 4-pin trailer wiring adapter issues
Tested the output at the receiver and everything works, plug in an adapter and only turn signals work...no taillights. Has anyone else had this problem or know a solution?
Tried several different adapters and had the same problem each time. Help!
Tried several different adapters and had the same problem each time. Help!
10-17-2014, 07:18 AM
#2
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2008 ML320CDI
Are the trailer tail lights LED? Are you able to test each pole on the 4 pin end of the adapter? I use one all the time and have had no issues, its possible the adapter is faulty
