You can check the polarity with a volt meter or test light. The black wire should be positive. A test light should light between the black wire and ground. Take out the fuse and connect to the line side of the fuse not the motor side so you don't read back through the motor. An easy place to find ground is the case of the power converter or the outside ring of the cigarette lighter socket in the TV outlet.
If it is wrong, follow the rubber covered cable. Look behind the panel under the kitchen sink. You will probably find a splice there.
Another possibility (though not as likely) is the leads on top of the motor may have been installed backwards. The motor is removed by carefully pulling up on the rubber boot. Don't loose the plastic shaft coupling. Sometimes it comes out with the motor then falls off. Once you have the motor out you can pull back the boot to get to the connections.
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