Check the speaker connectors to determine which one connects to the positive and negative terminals. The speaker should have a + sign next to the positive terminal.

Splice the wires from the door to the new speaker's wires making sure to connect the correct wire polarity. (The small connector wire from the speaker is positive.)

In the driver side door, the positive wire is red and the negative wire is white.

In the passenger side door, the positive wire is blue and the negative wire is yellow.

Cover and crimp the wires with the butt-end connectors.