wiper motor makes clicking sound when i run a test on it , i have found that i have an earth problem because when i ground the body of the wiper to the engine my blower fan starts to work so i guess running a good ground will fix its and the wiper issue , but does the clicking sound mean i have a dead wiper motor as i do have power to it ruffly 12 volts at the yellow wire , can any one advise me what to do next can it be rebuilt and how hard is it to replace any comments will be welcome