Here's my problem. I purchased a pump for my fog machine and I just received it in todays mail. My question is this: The wires coming out of the motor are not marked as positive or negative and I am quite certain that it matters. Please help me out with this information. Here are the specifications on the motor: JXJD---TYPE 40 DCB---110-120 VOLTS-60 Hz-----18 Watts ----Jiaxin Electric Co., Ltd