Trailer Light Adapter Question

[1985 Century Mustang]

I just purchased a direct fit T adapter trailer light kit for my 1993 Ford Ranger. I hooked up the adapter and then plugged it into my original trailer adapter. But I noticed there are 4 wires total coming off the new truck adapter and my original trailer ( the female adapter) has 5 wires total. Will this work before I start tracing wires and changing the bulbs. Photo Enclosed.

 

[briangcc]

Brown is your running(marker) light circuit so it makes sense there would be (2) legs - (1) for each side of the trailer. As long as its a 4 pin to 4 pin connection, you're good to proceed.

 

[1985 Century Mustang]

I was getting very low voltage coming off the truck adapter. I forgot to ground it to the truck chassis. It's all good now.

 

[Chris1956]

Not all trailers are wired that way. Some have the 4 wires in the connector, and run the running lights to one taillight and then the other. What you have is a bit better in corrosive environments, as it has one less bare connection to get dirty.