Bad Boy ZT series

I have a Bad Boy zero turn. My wife used it to cut the grass two days ago...when done, she washed the mower down with the hose. The next day, I started the mower to put it back in the garage and the left hand zero turn handle would not engage, only the right one. Only thing I could was go in circles. The handle moves like it is supposed to but it will not engage. I wondered if anyone has had a similar experience and could tell me what to look for? It's almost like an electrical part got wet and now it won't engage. It worked fine all during the 2 hours mowing session and this is the first time that I have had this problem..Any help out there? Signed, Baldeagledr

Check your bypass valve.