My 2001 sable has been in storage since may 2019. It ran perfectly when parked. Now it only clicks when trying to start. Battery fully charged and jumped doesn't help. Where else can I look?

 

Have the battery load tested.Unless you kept a trickle charger on it, it is likely shot. Go over and clean ALL connections on the plus side wiring and all grounds including at the engine block. Looks good doesn't mean anything if the connection isn't taken off and cleaned. You can use a volt meter and check for energy at the starter with a helper to turn the key.Still no crank after servicing the connections and battery, remove and get the starter tested.Hopefully,you have solved the problem by now. Let us know.