from what I gather 3 is your hot 12 volt wire,2 and 4 are power wires that go to the antenna motor and 5 should be your ground,,,,the shorting of 5 to the others in the normal position acts as an electric brake which is comon on motors helps to slow them down faster,, you may have noticed this on small cordless drills like makitas etc when you let off the trigger the motor doesnt spin very long,,,its a saftey thing....Jason