A Sandwich teenager has pleaded not guilty to charges connected to a fatal car crash in Barnstable last year. William Putnam IV was arraigned Thursday on charges of motor vehicle homicide by negligent operation, failure to stop or yield at a red light, and failure to slow or stop at an intersection. Putnam, 17, was released on his own recognizance and ordered not to drive. Police said he ran a red light Nov. 30 on the northbound side of Route 132 and struck another vehicle. A passenger in the other car — Luke Marshall, 24, of Brewster — died. Putnam’s lawyer told the Cape Cod Times that the crash was simply an accident.