WASHINGTON, Jan 16 (Reuters) - Ahead of a California hearing on the future of electric vehicles, the Alliance of Automobile Manufacturers announced details on Tuesday of its proposal for a test to determine whether there is a sustainable consumer market for battery-powered electric vehicles. The alliance, a 13-member coalition of car and light truck manufacturers who represent more than 90 percent of U.S. vehicle sales, issued their details ahead of a January 25 hearing to be held by the California Air Resources Board (ARB) on proposed changes to zero emission vehicle (ZEV) regulations.