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Joined: Mon Nov 13th, 2017
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You can access the factory head unit by inserting a coat hanger into both square holes to release the locking mechanism. There are 2 on each side. This will allow you to inspect the pigtail and try another factory head unit If you have one available.
The interior panels over the door and rear door( I'm assuming you have the powered 4dr ) are easy to remove. Once you've removed the visible screws and disconected the power window and lock rockers, lift up and the door paner lifts off, no clips to pull. Now you can check speaker connections.
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I know my crazy! Do you?
2007 Sport 4door 4x4 4.0L SOHC V6 Ranger