A raidator in need of a flush will not cause a battery drain.
Yes it can.
The wrong spark plug wire(s) can cause engine problems including not running but won't drain the battery.
A dead cell in the battery will cause it to loose it's charge overnight. The only fix is to replace the battery. Any light that is staying on will drain the battery. Also a stuck relay will drain the battery.
Dead cell in the battery. Something on which is drawing power from the battery. Stuck relay.
A short in the wiring.
there is a short some where in the electrical system... or a bad battery.
If it stays on all the time it will drain the battery
Dead cell in the battery or something is on pulling power from the battery. If it is a dead cell the battery must be replaced.
no , only the concrete and other cemented floors ....
Shorted diodes in the alternator.