Preheat the oven to 350F (180C) degrees.
Grease and flour a 12-cup bundt pan, or brush with pan release.
In a medium bowl whisk together the flour, baking powder, baking soda, ginger, cinnamon, and nutmeg.
In a large bowl beat together the oil, brown sugar, molasses and vanilla extract.
Beat in the eggs 1 at a time.
With the mixer at low speed, beat in about 1/3 of the sour cream followed by about 1/3 of the flour mixture. Repeat the process until all of the sour cream and flour mixture is incorporated.
Pour the mixture into the prepared bundt pan.
Bake in the preheated oven for 45-55 minutes, or until an inserted toothpick comes out clean and the top of the cake feels firm to the touch.
Allow the cake to cool in the pan for 20 minutes, then carefully invert the cake onto a plate and continue to cool on a plate.