Battery draining overnight in 2003 Lincoln

You need to do a parasitic draw test to find the circuit that has the short drawing down the battery. This can be done with a simple 12Volt test light or a volt meter. With a test light just disconnect the negative cable from the battery negative post Then connect one end of the test light ( gator clip to the negative post and touch the probe to the negative cable disconnected). The test light will light up if power is being drawn. Remove the dome light, radio and cigarette fuses as these fuses draw power when the car is not in use.Now pull one fuse at a time to see if the light goes out on the test light. If the light remains replace that fuse and move to another. The fuse that effects the light is the circuit with the short. Now check all connections of that circuit to find the short.

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