TheStreet's Jim Cramer says there's lots to listen for on Alcoa's conference call after the close Wednesday. Above all, he says he's looking for the decline in Alcoa stock to stop. This stock has been one way from $17 to $12. The reason for that is that they're doing a transformational deal which is going to make them much more aerospace but they're doing it with stock. Until this stock deal closes, Cramer doesn't expect Alcoa to have a gigantic run. But the idea that it can stop going down and go higher, that would be very positive. Cramer says from the call, we're looking for non-residential construction, we want to hear about how trucking is doing, we want a new read on China, we want a new read on Europe which has been weak and we want to hear about turbines. Alcoa stock is down about 15 percent for the year.