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I've got a 2008 Mustang V6 (5-speed manual) on which I just installed a Draw-Tite sport hitch. I've got a four-wire flat wiring harness for the lights but it didn't come with instructions. I'm no good at reading wiring diagrams, so I'm wondering which wires to connect to which wires.

The harness wires are, in order, White (exposed pin on the trailer plug), Brown, Yellow, Green. Am I correct in assuming the white wire is the ground? Are the yellow and green the left and right turn signals and the brown brakes?

I have a multimeter to figure out which wires on the Mustang are brake and turn signal, I just need to figure out which is which on the trailer harness.

On a Mustang forum someone suggested that the taillights on a Mustang don't have enough voltage to run a trailer, is this true?

BTW, that Draw-Tite sport hitch looks great on the Mustang - small and discrete.
 

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this is easily accomplished with a test light

look underneath the rear or in the trunk for the wiring to the tail lights

ground one end of the test light and start probing wires while operating the respective light

the stop and turn signal should use the same filament

so tail lights on, find wire and splice 4 way wire for the pigtail according to the chart you supplied, ditto that with the left and right turn signals, connect black to ground

and it's down the road motors!
 
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