I replaced the a heater core on a 2000 plymouth neon. And now wipers won't work

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I replaced a heater core on a 2000 plymouth neon. And now the windshield wipers are not working. I first checked the fuse which was not blown. Then I ran a wire to the positive and negative wire on the wiper motor. And the wipers came on with no problem. Next I replaced the wiper switch inwhich the wipers did not come on. So I replaced the wiper module and yet the wipers did not work. So I just want to get these things fixed as fast as possible. Please help me as soon as possible. Thanks.