They wear out over time, there could be a parasitic drain on the electrical system, something might have been left on.
No, you have a parasitic drain somewhere in your electrical system. The grounding strap isn't the cause of it.
Bad battery or a parasitic drain
It has a parasitic electrical draw. Usually on the older cars it ends up being the Stereo or an aftermarket alarm. But it could be anything electrical. You have to diagnose it one fuse at a time.
Yes. More so if it is connected. Most vehicles today put a parasitic draw on the battery that will drain it down over time. Parasitic draw should be under .050 mA.
An axiom for virtually all electrical problems, found to be especially true for those of this type: It's a bad ground connection.
could be a short or a parasitic drain in the electrical system... to little info to tell what it is. could be bad earth from battery
If the defect is causing a parasitic drain, yes.
Bad battery, Parasitic drain.
There's a parasitic drain somewhere.
Parasitic drain or other electrical problem
Parasitic voltage drain is typically power that is being drawn from a power source when an item should be "off". For example; when a car is turned off typically it is still drawing small amounts of power to run a clock or keep an alarm funtioning. This could be considered a parasitic voltage drain. Sometimes in household systems it is also referred to as phantom power. Some companies like Roemtech (which manufactures classroom audio systems) spends a lot of time and money trying to reduce parasitic or phantom voltage drain. This can amount to a lot of power savings over the span of a year.