Can't turn any part of 12AJA4801 on.

t-stat r and rc togather to furnace r
t-stat w to furnace w
t-stat G to furnace G
t-stat y to furnace y
on the furnace y their should be one cable with 2 small wires 1 goes to y the other goes to the neutral of the transformer terminal C turn the power off so ya don't short the transformer if its not all ready bad. Good Luck Tom