Hi,
I'm new to the forum and have an issue with my 2007 Mazda 3. There is a parasitic drain on the battery that kills it overnight. I traced it down to one of the 40 amp screw down fuses under the hood (#3 BTN ) When I look it up in the owners manual it says it protects various circuits! What the hell does that mean? I want to further diagnose it and eliminate the drain, but need either a schematic of the wiring system or advise. Right now the drain is around 150 milliamps after things settle down. This seems too high to me. My Honda has a drain of about 30 milliamps for the radio and such and am expecting this to be similar. Any help would be appreciated.
Thanks,

 

Fusible link #3 BTN goes to Fuse 47 and then to pin 16 of the diagnostic connector.