Question about the wiper system on an 88 YJ. My switch only says LO HI and one click only. What module box do I need. Part #'s? I think it has been worked on before. When I turn on the wipers at the first and only click it come on and is intermittent, low speed. As I move to high it is still intermittent and speeds up very little. I think it has the wrong module. Can anyone explain this system to me. Thanks!