2005 lincoln town car

A parasitic draw . Something in one of the circuits is shorted. To find the draw you need to do a parasitic draw test . This can be done with a simple 12 volt test light . Disconnect the negative cable from the negative battery post. On the wire end of the test light is a clip that needs to touch the negative battery post as the probe end with the light is touched to the negative cable just removed. This test light is now inline with the 12 volt system. If there is any draw the test light will be lit. Some things in a vehicle do draw small amounts of power and the fuses need to be pulled to these systems to continue with the draw test such as the radio and cigarette lighter and dome light. With these fuses pulled these should be no light on the tester. However if there is still a draw as suspected the light will remain on on the test light. Now remove one fuse at a time and not if the light goes out. If it doesn't replace the fuse and move to the next one until you find the one that effects the light of the test light when removed. That is the circuit with the draw and potential short. check all wire connections and grounds of the circuit for a problem. If it is a lighted circuit check the sockets and bulbs.