Tracking down electrical gremlins

[WankelsRevenge]

Recently I've been having some issues with my battery not wanting to hold a charge. I know part of this is due to the cold weather along with not driving my car regularly. However I jump started it one day and got it running, but the next day my battery was completely dead. One clue I do have is anytime my car has power but isn't running (I have a master kill switch on my batter which I've been using to completely kill the power to my car) my turn signal arrows in my gauge cluster are lit up. I have no idea what this may be a sign of but it started doing this right at the same time I started having electrical issues. Does anyone know what may cause this or what it's a sign of?