I'm Old school , unhook one side batt cable. Hook up a 12 Volt test light in line between batt cable and batt. If you have a drain that will discharge the batt in less than 3 days the light will burn brite. We usually use extesion leads so we can put the test light on the windshield. or somewhare easy to see it. Now start pulling fuses one at a time until the light goes out. Don't forget to unplug the alternator also. If no luck than go gack and pull all fuses. sometimes more than one feed can be shorted. A crimp in the harness where it got hit by something. Good luck and Keep It Simple.

steve