i own a 1990 Ford Areastar with approx 250,000 klm, has a 3.0 v6 motot with ac
problem is over night loose almost all power in battery
i have replaced battery solenoid,both battery connections, cleaned connections on solenoid and cleaned up some of the ground wires
also took starter out and had it checked. it will start with a boost and then start again and again until you leave it over night, when it is started alternator seems too be charging battery. running out of things too check for any help will be appreciatted

 

You have a drain, but obviously you probably know that. Easiest way to troubleshoot will be to remove fuses a couple or a few at a time (paying attention to which you've tried and making sure to put proper ones back in their places) for several nights. When you wake up one morning and it cranks, whichever fuses are out is where you'll find the drain. Then narrow it down one at a time.