I'm in the process of converting to delay wipers I have a newer style column with the delay on the column and am going to eliminate the switch on the dash,I hooked up the used delay wiper motor to test it except for the delay wire and it doesn't work ,do I need the delay wire for it to work properly or could I have a bad used motor? also is there any relay or anything that needs to be installed between the blue wire from stalk to motor? thanks.