Normally those systems as Abs and Air Bag needs a constant and stable power supply,and your battery maybe is corroded internally nad does not hold the charge. The computers in those systems performs a system check,which measures the battery's capacity to hold and handle the amperes requeriment of these systems,the ABS makes a complete cycle of the electrical motors and they have electromagnetic brakes which draws a lot of power. Install a new battery and your problem will be solved,maybe you need to erase codes for low voltage in the system. Your alternator is likely dead. My 1999 Grand Am is on it's third now (119K miles).
When you car is turned off your battery doesn't have the alternator pushing that constant stream of voltage to your battery to keep it charged. So your looking at a decrease in voltage by 2 - 3 volts while car is off. No part will fix this just simply start your car before you turn on your head lights.
with today cars there are several relays which are used to send electricity to certain parts of your electrical system, such as a fuel pump relay, or a starter relay. one thing i tell people to do is have some one try to start your car with the lights on if the lights go off while trying to start the battery is dead . if the lights stay lit with very little dimness then you have a starter problem. Could be loose or dirty battery terminals, bad cable, starter solenoid. load test battery just because it has 12 volts does not mean there is enough amps to turn over check corroded terminals especially side terminals pull them off and pull bolt out and check both sides for corrosion
Yes, a loose battery cable will prevent the alternator from charging the battery. The drain on the battery is not caused by the engine not running unless an accessory is left on. Most likely, the drain is caused by accessories (radio, lights, etc) while the engine is running due to the battery not receiving its charge from the alternator and then not having enough charge left to start the engine.
Maybe you have a problem with your car's battery. If your battery's dead, your interior lights and radio wont turn on. So if you wait for a while and your radio wont turn on, then probably the problem is with the battery. If it is, than you should check the your battery fluid. If its not the battery, maybe there is something wrong with your starter motor.
Battery connections. The starter should NOT have been touched during the operation the battery had to have been removed. Make sure all your grounds and connections are corrosion free and properly installed. Lights is not an indication there is good contact from the battery. They need little contact to operate while the starter needs a fair amount of contact. Only other possiblity is the ignition switch, Clutch switch(if manual), or Park switch (if auto) is bad
If your car does not turn over that usually means that your battery is dead, also accompannied with a lack of interior lights, guages, etc. when the key is in the start position. You should be able to start it with a jump. Also check for corrosion around the battery terminals, could be the cause. If it hasn't started for a while you will need to let it run for a bit to recharge the battery.
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