It is unlikely that you would go to jail for hiding your car from a repo man in Wisconsin. However, it is possible. If you hide your car and the lender gets a court order to repossess it, and you still refuse to turn it over, you could be held in contempt of court. Contempt of court could in some instances result in jail.
The likelihood of you going to jail for hiding your car from a repo man depends on a number of factors, including the value of the car, your financial situation, and other factors. If you are facing repossession, it is important to speak with an attorney to discuss your options. An attorney can help you understand the law and protect your rights.