battery drains out overnight
I got an A/C recharging done by an auto repair shop two days ago. At the time of
recharging, the mechanic replaced a new relay in the fuse box at the engine
compartment. Unfortunately this morning,my car could not start,even nothing showed
on the dash board. The battery was dead 100%. After Jump-start, the engine can run
well. What was caused the battery drain so bad ? Is that new relay wrong?