Yeah, they were. They started off in Oakland, moved to LA then returned later to Oakland
From what I hear the problem in Los Angeles has always been a stadium. The people of Los Angeles refused to pay for a stadium. The NFL held their breath but the people of LA would not budge. Finally the Rams owner agreed to pay for the stadium himself and the Chargers feel that they will get a better deal sharing a stadium in LA (and some of the cost) than having to build their own stadium in San Diego. The Chargers were also not going to get the people of San Diego to pay for their stadium.