i cut the following from another site. this will not isolate a problem in a non fused circuit, but it should help:
Remove the negative cable from the terminal and put a test light between the cable and the battery post. If the light glows, there is a drain.
To find what circuit is causing the drain, remove one fuse at a time until the light goes away. Then, install them one at a time. When the light glows there is a drain, when the light is off, the bad circuit was removed.
You may not get the light to turn off. In that case, it means that there is a drain in some other circuit that does not run through the fuse panel.
First place I would look at is the starter. Starters have been known to short out at the solenoid and cause a constant drain to ground.
Good Luck!
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