To be more specific ( in case you aren't an electrical genius like pizzaguy or padgett ) :
1. get your hands on a DVM ( Digital Volt Meter ) and set it to the milliamp setting. There is a separate socket for this different from the + & - sockets for reading volts.
2. Disconnect the negative battery cable ( the one toward the front of the car ).
3. connect the DVM in Ma scale between the cable and the negative battery post, check the reading.
4. open the under hood accessory fuse box ( on the driver's side ) and start pulling fuses one at a time while watching the meter.
If the meter goes from like 60 ma down to 20 ma when you pull a fuse, then find out what that fuse is for.

Get back to us when you find the offending fuse for more help.

Mark, Mr padgett : not trying to horn in, just seemed to me a bit more detail was needed here.