If your 2004 Mercury Monterey has the 3 relays and 2 fuses installed then chances are good that it also has the tow package plug-in connector to mate with 4-pole harness # 56073. But if you are not sure you can still install a 4-pole harness by using kit # C56673. This harness comes with the needed relays to activate the plug on the back of your Monterey.
This 4-pole harness will provide stop, turn and tail light signals for a 4-pole-equipped trailer. view full answer...
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