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Parts Needed to Add Trailer Brake Controller to 2005 Mercury Mountaineer with 4-Pole Flat Connector  

Question:

Hello I need to add a trailer brake controller to my 2005 Mercury Mountaineer. It currently had just a four flat connector, can you please tell what all I will need to complete this setup.

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Expert Reply:

Brake controller installation on your 2005 Mercury Mountaineer that has a 4-pole flat trailer connector will require just the brake controller and a 7-way socket.

An outstanding reliable brake controller with versatile features is the Prodigy P2 # 90885. This is the most popular unit we sell and it is highly-rated by our customers for its easy set-up.

Along with this you'll need 7-way # 37185 which plugs in to your existing 4-pole and provides connectors for your brake circuit (blue wire) as well as other trailer functions as noted on the linked photo. I also linked an article to help you with your installation.

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Adam R
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