I have tersted my IAC from the battery on many occasions. If it is working you will hear a click. Like Doug said it doesn't tike to have the polarity reversed. That could have fuged it up.

99 CSVT Green/Tan # 84 of 2760 Built on Wednesday, September 30, 1998 15.376 @ 92.00 MPH Stock 75,000Km 96 Contour GL 2.5L V6 ATX 170,000Km