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How can i cut ALL POWER to my interior lights on my 1981 coupe deville? Something ls draining my battery while i drive. Alternator and battery are new. The fuse for my interior lights has been removed

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If you removed the fuse for that circuit then that is not what is draining your power. You have to look elsewhere.

Posted on Dec 01, 2016

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1 Answer

Something is draining my battery on my 2003 Chevrolet Suburban


often it is the tiniest light or circuit eg tailgate, trunk or door interior light switch. wait for dark and then check for the glove box light or under hood light or other interior light. is the radio turning off ok?
with the ignition and motor turned off connect a 12v voltmeter to the battery then disconnect/reconnnect one fuse at a time and observe when the voltmeter flickers. remember that alarm systems and clock in radio draw current at all times.
with the engine off, put your hand on the alternator. if it is hot then the battery is trying to make it spin like a motor due to a failed rectifier. these are built in to the alternator housing so an exchange alternator is needed.
it may be that your battery has seen better days. batteries are very sensitive to cold weather. have the battery load tested. better a new battery now than stuck in the snow with a dead engine

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My 77 coupe deville keeps draining the battery.i got new battery I got new battery post .i did not change the alternator because when I take the - cable of the battery my car stays on..can someone please...


To begin with, please don't ever disconnect the battery cable with the engine running. You can cook the alternator and the computer.
Have you pulled the fuses and disconnected everything to check for a drain ?

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1 Answer

Power to battery ran down on toyota camry . both battery and alternator tested good. any suggestions what i should test next?


make sure all lights are off,interior and head lights,something still draining it for power when off,have battery checked for dead cell.

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I put a new battery in my chev equinox 2 weeks ago seemed ok if I drove it every day, but if I leave it a day its completely dead, alt is charging at 14.7 volts, the only thing on is the security light on...


You need to make sure that your getting good conection to your battery. If your alternator is fine, as you stated, you might not be getting a good conection. Your alternator may be keeping your battery alive just enough when your driving. Check all connections. Hope this helps.

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Battery died, replaced 3,three,111, days later.now Ihave no ing. or starer power


Something is draining the battery, Is the battery drained after sitting over night or within driven miles. If it drains over night power is being puled from a source, or the voltage regulator inside the alternator is pulling the power and draining you battery.

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My 2000 lincoln ls battery keeps dying have bought 2 new batteris same peoblem is something draining the power?


Either something is draining the power or your alternator is not recharging your battery. Do you have a DC voltmeter? With the engine running check the voltage accross the battery it should be about 14 volts. If it's down around 12.5 volts with engine running the alternator is not working. If you determine the the alternator is working and the battery goes dead, then there is a draw on the system. It could still be the alternator though, there are diodes in the alternator, a diode acts like a one way gate for electricity. With one bad diode the alternator will still work but, when you shut the car off the alternator drains the battery back down. Something is drawing it down, without testing equipment, you'll have to take it to a shop. Something you could try, after the car has been shut off for while, an hour or more, go feel if the alternator is warm or hot, if so it's drawing the battery down. Disconnect the battery overnight so it doesn't go dead on you.

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1 Answer

Battery drain


When the car is shut off, there should be a very small load on the battery to keep the clock running, the security system on etc. But the amount of current is really small. If the battery is dying overnight, something is loading it;
Charge the battery right up.
Have ignition off, doors and trunk closed, no interior /exterior lights on and leave the driver door window open.
Take a fairly large automotive bulb like an 1157 or even a headlamp.
Disconnect the negative terminal on the battery.
Connect one wire to the negative terminal of the battery from the light, and the second light terminal to the negative battery cable you diconnected; connecting the light in series. Don't put the negative battery terminal on the battery.

The bulb should not light if all your ignition system is off and you have no lights turned on.

Turn on the lights or blow the horn by poking through the open window without opening the door, the test light should light and the horn sound.

If the light lights without anything being on, then you have something constantly draining the battery.

Go to the fuse panel and remove and re-install each fuse one at a time from every circuit. You may have to close the interior light door switch by pushing it with something while you are getting to the fuses so the circuit is in the off state all the time. Everything has to remain off.

When the light goes off when you removed a fuse, that is the circuit which is loading the battery. Check the fuse description for the circuit affected.

My guess is a trunk light that stays on even when the trunk is shut. If it is a lighting system fuse causing the problem, remove the trunk bulb and replace the fuse. If the light goes off, the trunk switch is defective keeping the light on all the time.

You can also place a battery charger on the battery (connect the negative back on the battery) and go and check the car in the dark. Is there a light on like a floor lighting in the interior? Do you have a light on under the hood that can't be seen during the day?

Always make sure you have a good charged battery, and that the terminals are really clean before you start analyzing the problem.
Does the alternator charge the battery? Check by measuring the volatge across the battery engine off, no charger connected; should be 12V or close.
Start the car, the meter should read 14V or so, but more than without engine running. If not, the alternator/charging circuit may be the real problem.

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CHECK THE FUSE OF THE ALTERNATOR OR CHECK IF THE ALTERNATOR IS CHARGING

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First test the alternator output. Should be between 13.5 and 14.5 volts. Might just be a bad alternator

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