Take a look in the trunk, where an automatic antenna would be installed. Left side, toward the back. If you see an antenna wire, it will probably be siamese with the red antenna trigger wire. This, combined with the green, battery hot wire to the trunk lid is all you need to wire in an electric antenna.
Of course I am answering this as if you own a '90 240 sedan, but have actually no clue what you own.
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Art Benstein near Baltimore
Two antennas met on a roof, fell in love and got married. The ceremony wasn't much, but the reception was excellent.
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