Remove the negative battery terminal, then hook up a test light to negative terminal which you removed, just clip the test lamp to the cable terminal. Connect opposite end of light to the negative post on battery. start pulling fuses one by one from fuse box. When test light goes out, that's the circuit that's draining battery. ( let sit a couple of minutes then pull fuses). God-Bless you and your family.
SOURCE: 97 nissan sentra put new alternator and battery car wont start
are you sure the alternator is good? because it could be tricky ...The only other thing is the wire running back to battery pack to charge battery maybe disconnected
SOURCE: I have a bran-new alternator. But my car still
CHECK ALTERNATOR FUSE + FUSE LINK TO MAIN BATTERY FEED WIRE.MAKE SURE YOUR BATTERY CABLES IN GOOD SHAPE.IF THEY ARE OLD REPLACE THEM.BECAUSE THEY WILL CAUSE HIGH RESISTANCE IN CIRCUIT CAUSE CHARGING PROBLEMS. AND CHECK ALTERNATOR POSITIVE WIRE AND VOLTAGE REGULATOR WIRE.MAKE SURE DRIVE BELT NO SLIPPING.ALSO MAKE SURE YOUR BATTERY IS 12.5 VOLTS.IF BATTERY IS WEAK ALTERNATOR WILL NOT BE ABLE TO CHARGE IT.IT WOULD BE LIKE A BUCKET WITH LARGE HOLE IN IT.KEEP FILLING IT WITH WATER IT WILL LEAK OUT.IT WONT HOLD NONE.
SOURCE: parasitic key off battery drain, how to fix
Keep the ammeter in series with the battery with everything off. take out each fuse in turn and note any change to the the residual current drain. The fuse that when pulled out results in a drop in the current drain will identify the guilty circuit. Interior glove box and trunk lights are classics for staying on when they should be off, often the contact brackets get bent and so not longer push the switch as far as they should to break connection. Good hunting
SOURCE: My car battery keeps getting
You need to put an AMP Meter in series with either battery cable, and then look for a circuit not timing out,after you remove the key.
May take 20 minutes.
Anything over 40 Milli-Amps is too much
Start pulling fuses one at a time, to find circuit, then you need a wiring schematic of complete vehicle to find problem.
I always purchase shop manuals and wire diagrams, as soon as I buy a new vehicle. Will need owners manual -for fuses.
SOURCE: my kia keeps dying! 2000
WHEN TURN OFF CAR CHECK TO SEE IF RADIO TURN OFF.CHECK TO SEE IF INTERIOR LIGHTS OFF.MAKE SURE HEADLIGHTS TURN OFF.IF ALL LOOK GOOD.YOUR POWER DOOR LOCK FAULTY DRAIN POWER.FAULTY BLOWER MOTOR RELAY DRAIN BATTERY.FAULTY STARTER RELAY OR SOLENOID DRAIN BATTERY.FAULT IN THE PCM WILL DRAIN BATTERY.MANY MANY THINGS WILL DRAIN BATTERY.
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