Assuming it's actually a drain and not a bad battery, check for:
-aftermarket electrical equipment such as plow, cell phone, alarm
-door or glovebox not closed
-bad alternator diode (may be intermittent)
-corrosion at starter B terminal
-something else
Dead cell in the battery or the ignition or lights were left on.
Check your battery for loose connections and check your alternator.
A dead cell in the battery will cause it to loose it's charge overnight. The only fix is to replace the battery. Also if something is on drawing power from the battery it will run it down overnight. Look at all lights. Interior, under hood, trunk, give box, brake lights, etc. It can also be a stuck relay.
Good possibility
Yes, IF the ignition SWITCH was left ON. I suggest charging the battery, and then have it tested at Autozone both of which are free.
No, a fuse cannot cause a battery to not hold a charge. However a dead cell in the battery will cause it to run down overnight. Also there may be something on that is drawing power from the battery. Under-hood light, trunk light, dome light, glove box light, etc. Also a stuck relay will drain the battery.
bad ignition switch, bad battery, bad alternator/regulator,
No it cannot unless alternator is not charging the only power a diesel requires is for fuel cutoff solenoid
The answer is no . The battery starts you vehicle , the alternator charges the battery so if your alternator is bad your battery is not receiving a charge which will cause a "no start" condition.
It won't. Look for a light that is on or a stuck relay. Also a dead cell in the battery will cause it to run down overnight.
Dead Battery. Are you sure your battery can maintain or hold a charge?
happened on mine when the battery shorted out against the bonnet