New Battery that is already drained. All interior lights on after battery installed and would not turn off

Suggested answer below is perfect..
(check the interior light switch...
then move on to the door switches)..

If you have already done that

FREE wiring diagrams fro most popular USA market vehicles
are available (registration required) at BBB Industries... Also see their very helpful TSBs (technical service bulletins).

Hope this helps.

((and don't forget to put in that new dome bulb)).

BBB Industries Premium Alternators Starters Power Steering Products

Carnac the Magnificent

Check for any lites left on somewhere, interior--under the hood, whereever. Best time to check is in the dark. Sometimes a faulty generator can cause the battery to drain. Then, I pull /replace fuses, one at a time. When you pull the fuse on the problem circuit the excess drain goes away. Then you check everything on that fuse circuit.

I don't know about cars

can i buy a comma? says vanna white?? LOL !
ok, the battery drains, so you got a DRAIN, called phantom drain.
or dark current.!!
we use a thing called an AMMETER (DMM) to find all drains, easy

do you have one, want to learn or just wanting wild guessing.

on any 08 liberty, we check the scan tool data.
oops it shows battery low, wow even the PCM sees that.

new batteries do not fix drain.
nor dead alternators.

get it serviced, by a pro. ?

1: charge battery (rested its 12.6vdc )
2: start engine, scan tool shows, what DTC errors (post em')
3: battery voltage is , 13.3, to 15vdc running, if not charge system is faulting.
4: ok all that is ok, i then key off and measure bettery cable neg lug drain current, if 0.010a to 0.040a its ok, if over 0.1 amps its a drain.
we then find the drain cause, ASK? its not hard with a meter.
but i bet all you wanted is a wild guess.

Check all the little lights, in the trunk, interior of the car, even under the hood sometimes, to see if one is stuck on. Find it's switch.

You have a faulty alternator, You need to get it checked or you will damage the new battery due to excess current drain.
It could be repairable or you may need a replacement alternator.

Have you confirmed by going out to the car at night that none of the interior lights or lighted visor lights truck or hood lights are staying on? That is by far the most common cause of a battery drain. Other less common cause is a defective alternator rectifier diode Disconnect the battery overnight as well to confirm you don't have a shorted battery cell, that to will run the battery down, it is called an internal drain. Also make sure the top of the battery is clean of any acid.

well many things will drain battery, faulty alternator,bad door power lock.radio could have short.interior dome light remain on.short in ignition switch or ecm will drain battery.

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.

Here is a procedure to isolate a battery drain I found elsewhere and has already proved very useful several times.

Remove negative battery cable from the battery. Using a 12-volt test light, hook one end to the negative battery post the other end to the negative battery cable you just disconnected. The test light will glow or “light” if there is a drain. If the “light or glow” is faint, that is probably normal draw for the clock or computer. If the “light or glow” is bright, then there is a large drain. That should be corrected. Now start removing and replacing the fuses one by one until the light goes out; that one will be the circuit with the drain. ***Remember to hold in the button in the door jam for the interior lights.***