Just picked up my first car an na 1996 300zx and I thought I had tested everything including the wipers I turned them on and off and they went up and back down but now that I have the car and went to use them in the rain they aren’t working, when I turn the dial to the different modes they sometimes twitch up a tad but then when I turn the dial to the off position they do a full cycle up and down and stop, so the motors work fine, any clues what it could be my best thought is a faulty relay? Thanks.