Battery drains within a few days of non-use. Vehicle has no add-ons

Thanks for all the help... Turns out that is was in fact the ignition switch. One one the pins inside switch was sticking . Mech. Sprayed some type of cleaner into key hole and work on it a bit and fixed the issue ... I did however take a light tester and disconnected the neg. side and grounded the tester to the cable then to the neg. pole and and it lit up showing something was drawing power, then messed with ignition switch and was able to get it to go off once or twice showing me that it was the switch... Hopes this might help someone in the future. Thanks again for the help

thank you for your reply! Glad you got it fixed.