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Normal overnight disharge of battery - Cars & Trucks

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A battery should not discharge overnight check for drains on battery. items like lights ,vanity mirror glove box. also have battery checked ,it may be bad .

Posted on Dec 15, 2014

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1 Answer

Battery drains overnight


It is more likely to be a faulty voltage regulator on the alternator. this normally prevents the battery draining to ground when the engine is off.
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Mar 28, 2016 | Cars & Trucks

1 Answer

Car will start when it is warm, but refuses to crank when cold


post is good and clear, no engine size stated.>>>
can you jump start it?//
this simple check proves battery is good /bad or just discharged.
yes, jumps and runs. (ever clean the battery lugs ever?
if it jumps the battery is bad/or disharged, so charge it.
no, wont jump cold
bad starter. or funky key line.

1: i hot wire these starters,
cranks ok, good starter.
no crank bad key line
if key line is dead, well wiggle the key and wiggle the gear shifter.
is car a A/T or M/T.
if M/T wiggle the clutch.
now you have your answer, an why. how is a differnt horse.

Dec 26, 2013 | 1992 Honda Civic

1 Answer

Engine won't start, starter makes rattling sound


sounds like the battery disharged. If the key was on along with the lights than 20 minutes would be enough to drain the battery. Try a jump start. it should get you going. I would have the battery tested after driving for at least an hour at highway speeds just to make sure it is good.

Apr 30, 2013 | 2010 Ford Fusion 2.5

1 Answer

What is the correct alternator charging voltage for kia pregio 2004


sounds like a bad diode in alt. but the normal voltage is between 12.5and 14.5

Feb 01, 2013 | Cars & Trucks

1 Answer

93 volvo 940


Check the condition of the following:
1) Battery voltage (should be over 12.5 volts.2) Spark plugs, leads and coil3) Air filter4) Fuel filter
If battery voltage is low, then using a ammeter, connect in series between battery positive lead and terminal. With vehicle off and all systems off it should be no more than around 0.03 amps. If it is, then pull fuses until this drops to normal. The fuse you pull which returns it to normal will indicate which system is affected and pulling too much power from the battery.If all is normal, then replace battery.

Nov 14, 2012 | Cars & Trucks

2 Answers

Light on dash reads "check


nancycmixon, When you see this "check your charging system" you need to have the alternator checked. This is the main component for the charging system. A normal alternator will put out 13.6 to 14.6 volts. A few tenths of a volt either way won't mean too much but if they are extremely over or under these values means you have a bad alternator. I believe that your vehicle has a voltage meter in the dashboard and it will usually read in the thirteen to fourteen volts range. As far as your battery losing its charge overnight means that you have another problem and that is you have what is called a parasitic drain. There are a certain amount of parasitic drains already in the car with the radio memory and maybe a clock that constantly displays the time and the antitheft system in the car. These will not drain your battery overnight. You have something else draining your battery that is your problem. Have the alternator checked and mention the battery drain. There is test for this but it is too lengthy to post here. Sorry about that. Good luck with this.

May 13, 2011 | 2005 Ford Taurus

1 Answer

98 Ford Explore with new battery and it drains overnight. Had a garage check power streams and they say everything looks normal. But battery continually drains


Have your alternator and voltage regulator checked. I once had a galaxie 500 that did the same thing - turned out the alternator was bad and the regulator drained the battery overnight. I changed out both and problem solved - hope you have the same luck!!!

Nov 22, 2010 | Ford Explorer Cars & Trucks

1 Answer

My mercedes sat for 10 months while I recuperated from injuries. The battery was completely dead. Remote didn't even work. We were able to jumpstart it with battery cables but it won't keep running. Dead...


You will burn out your alternator if you keep on doing this.The alternator is not a charger. If you have a dead battery you should always charge it overnight on a charger.To keep the battery fresh all that you have to do is disconnect the terminals.Yes this is normal because the car has clocks and alarms that drain power even when the key is off. If you let the battery set to long while it is drained it will not take a charge.

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