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When you ask for help, always include the year of your vette!!!!!!! Excessive leakage current (current drawn when car is off) can cause your battery to discharge quickly. GM says leakage current should not exceed 50 milliamps. My 87 draws 27 ma. First, charge up the battery and at night check the underhood lights, vanity mirror lights, door map lights, console light. Do you have a radar detector, aftermarket radio, aftemarket alarm, audio amplifier? Check em. Do you leave your key in the ignition? that keeps the VATS circuit on and can discharge your battery. If all ok, then remove the negative cable from the battery and connect a VOM (voltmeter, ohmeter, milliammeter) from the neg batt post to the neg cable with the test meter set on milliamps and on its highest scale because the courtesy lights will come on. When the courtesy lights time out, switch to lower scales until you can measure the leakage current. Pull the courtesy light fuse so you can keep your passenger door open and pull fuses one at a time and watch the meter. One fuse that makes a dramatic drop in current will locate the circuit that you need to investigate.