The white ground wire on the Curt 2 to 3 Wire Converter # C56196 does not need to be connected to the white wire on your 5-way connector, it can get the ground from the frame of your trailer.
Not all lights have an actual ground wire as some get the ground through the mounting hardware, it will depend on which style your lights are and what material the frame of your trailer is made of.
If your trailer is steel then grounding each light to the trailer frame is fine, but if the trailer... view full answer...
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