Ever since I got my XJ(90 Pioneer, 2-door) the rear wiper hasn't worked, when you press the switch there is a loud click in the vicinity of the rear wiper motor then nothing until you turn it off then another click so I go to the junkyard today thinking the motor itself is the problem, I remove 2 different motors plug them in and same thing, I narrowed the clicking to the square box plug that a fellow XJer said is for the intermittent wiper so I tried 3 other box plug things hooked up but there was no difference, still a clicking. Anybody have an idea what the problem is?