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Get a incandescent (not LED ) test light , remove the negative cable from the battery
Clip the light between the battery post and the cable
If something is using juice the light will light up , and it’s brightness will be in direct proportion to the amount of juice being used
If it’s really dim just glowing slightly not much current draw
If it’s bright , something is using a lot of power
Then start at the first box and start pulling fuses while a helper watches the light
When you pull the fuse that includes whatever is draining the battery the light will go out
Now you know where to start looking
If it’s the fuse for the radio , or the fuse for the dome lights or whatever , you have narrowed it down enough to be able to know where to look for the problem
You might pull all the fuses and the light still is on which will means that whatever is draining the battery is not fed Thru the fuse box
This will include stuff like the headlights and parking lights andbrake lights
Horn etc
It could be the alternator
Removing the wire(s) from the alt will tell
I get it, but there is no light to compare against because the test light keeps going out.