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Make sure your outside connection is tight. Then with a strong light. Open the passenger door and look in. Verify the connection thru the body is tight. You will see it as it exits. The other way to the radio it is only a 4' jumper of coax wire/cable. Unless the previous owner pulled the radio the connection under the dash should be solid. If you decide to pull the radio to check that plug in. Unless you have really skinny long arms! See F5s thread on installing navigation system. Not that hard to do. Good luck!