Refrigerate can of crushed pineapple for 30 minutes.
In a large bowl, combine gelatin and boiling water. Stir until dissolved.
Drain pineapple through a sieve and add juice to gelatin.
Place the pineapple on a paper towel to absorb the moisture and set aside.
Stir cranberry sauce into gelatin mixture until blended.
Chill mixture until it starts to thicken about 30 minutes.
Fold in sour cream, pineapple and pecans.
Pour into prepared bundt pan.
Chill until set, at least 2 hours.
Notes
When ready to release the mousse from the bundt pan, use a knife around the edges and center to get air into the pan. Place a plate on top of the mold and flip. You may need to tap quite hard to get to release. Be patient, it will release.