i think it is part of an old alarm system, there are wires running to the glove box with 2 switches, there was a box that said crimestopper with an antenna wire that was looped around behind the back seat. Just as you open the door there is a barrel key alarm lock, i swear at one time it must have been the car to steal or it lived in a bad neighborhood, there is another barrel lock that locks the hood via cable.

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"NEW" 1984 300D TD needs some love