To find a drain, BUT FIRST!!! Arm yourself "in general" electrically. I don't know what you have but here is what you NEED to have
1...Parts store 12V test lamp
2...Some sort of multimeter
3...A FACTORY shop manual. No excuses. You can download them, free over at MyMopar. Several of those came from guys on THIS site
4...In addition, a "heavy wattage" test lamp. This is very handy for certain jobs. use something like an old stop / tail lamp socket, with an 1157 bulb. You an wire this a number of ways to make it more or less wattage
5...A parts store in line spark tester. If the thing quits you out "there" these are very useful, and cheap
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Disconnect the battery ground cable, and wire your 12V test lamp in series. This is best in subdued lighting. Does it light? Go round and make sure everything is off. Trunk/ hood / dome / glovebox lamp, radio, aftermarket accessories.
Next start removing fuses, one at a time. Look for a dimming of the lamp, or "goes out."
When the lamp is very very dim, or goes out, get your multimeter and substitute it for the lamp BE CARE FUL. A multimeter is sometimes not, or not very well protected against over-current when measuring current / amperage. ALWAYS start with the highest amperage scale and work down, and don't use it at all until you get the test lamp down to a "dim" level
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Don't forget, this can also be a battery going bad. "New" does not mean "good."
