Cadillac Repair: 1999 deville concours, deville concours, blower motor

Question
Blower stoped working on 99 my wifes 1999 deville concourse
the plug to the motor has a red wire (  13v all the time with engine running) black wire(- ground) and a gray wire (it reads to a negative potential all the time no mater what temp. or fan speed setting but has a high resistance to ground about 16 K ohm.) how do i check the blower motor.
any help would be greatly appreciated ken underwood  

Answer
If you are mechanicaly inclined or know of someone who is, You will need a DIGITAL MULTIMETER, Simple electrical schematics, Test procedures and picture locations of the components within the system that is causing you problems of which can't be done on this website which only allows one picture. I do not have a website so you will have to e-mail: onlineautohelp@msn.com in order to obtain the information.