When the car is left overnight the battery is flat the next day. Also the dash boad lights are on indicating a problem with the brakes and the airbag.

I let someone drive my car and the lights were left on overnight - then when I drove it at night my radio, clock and lights would surge on and off - the next day it wouldn't start easily, we had a local auto parts store read our codes and they checked the battery and alternator - after I replaced the battery, we noticed there was still a light on without the car turned on - anyway now the lights are back in automatic off and the car runs normal. Wish I would have checked if any lights or overhead lights were left on first before I got the new battery.

old post
left key to on, while doing service
turn the key off
battery installed backwards

Check alternator voltage output, might be low. obd2 scanner

check the radiator censor making sure that the wires for this have not come off is there any fluid on the road when its been left for a few hours normally a car loses water any way may be half a pint a month or so this is normall check hoses for splits before forking out for a new water pump

check for loose / dirty ground wires and points
indicates a voltage circuit being broken and the ECM is loosing voltage to work

leaving the radio on all night would not cause the battery to drain away like this providing its a good one .try disconnecting the battery overnight and see if it still drains as sometimes a battery can drain flat on its own which is caused by sulphation across the internal plates in the cells ,then if if it starts the next moring the battery is ok ,so next is to discoinnect the alternator large terminal off the alternator and try that and if it starts the following day renew the alternator as a rectifying diode is down running battery flat ,if still a proble then out comes the tester to look for a relay that has the contacts stuck together or the favourite boot light but this is a pick up truck so i would suspect the alternator

did you change the battery ? wrong amps or voltage could do that sometimes. it's called reverse polarity.

Circle with dashes on the outside is brake pads worn indicator. The light bulb looking one is exterior bulb out indicator, the triangle if you have it is ASR slip.

have you not left any load on overnight?..like park light or left the door partially open and the dome light would be left on?

have the battery recharge and the next night, make sure that no light would be left on the car.

if it would drain out again, have it recharged again, use it and on the night, make sure no light is left on the car, then remove the positive pole on the battery overnight.

the next morning, put the positive cable back and start the car.

if the car would start, then no problem with the battery, if the car would not start, then return the battery because it is defective.

tnx 4 using fixya,

drcool

start with battery. sometimes older batt. won't hold a charge overnite. disconnect battery and reconnect next day and check. if batt is ok disconnect alternator overnite and connect next day to see if it was problem.