The 4-pole trailer connector provides power for the trailer lighting circuits only, right turn, left turn, brake lamp and running lamp. The 7-way provides those, plus voltage for electric brakes, reverse lamps a 12-volt accessory power feed to the trailer.
In a nutshell, if the trailer you're wanting to tow does NOT have electric brakes, it'll likely have a 4-pole. Larger trailers would usually have electric brakes, and would use a 7-way trailer connector.
If your MKT has the tow package,... view full answer...
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