I had an issue with my Subaru just like yours. I left the battery hooked up buy made sure it had a full charge. I removed all the fuses then started to insert them one by one while watching the voltmeter. I noticed a huge drop after I plugged in the power door lock fuse.....no more power door locks for me.

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'85 300SD (formerly california emissions)
'08 Chevy Tahoe
'93 Ducati 900 SS
'79 Kawasaki KZ 650
'86 Kawasaki KX 250
'88 Kawasaki KDX200
'71 Hodaka Ace 100
'72 Triumph T100R