Dead cell in the battery, any light on the car that is staying on, or a stuck relay.
A raidator in need of a flush will not cause a battery drain.
Highly unlikely.
The wrong spark plug wire(s) can cause engine problems including not running but won't drain the battery.
Yes it can.
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.
If it stays on all the time it will drain the battery
there is a short some where in the electrical system... or a bad battery.
A short in the wiring.
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.
There are a few reasons why a battery may drain overnight on a 1987 Cadillac Fleetwood. One reason could be the alternator needs replaced.
Either something is on and is drawing current from the battery or the battery itself has a dead cell which will drain the battery. If the battery is over 3 yeas old, replace it.