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Battery goes dead overnight, tests ok - 2008 Lincoln Mkz

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Battery constantly goes dead, even after it was the simple tests on it before you spend big bucks having a shop pin down the will need needle nose pliers, 20 volt dc scale volt/ohms meter, test light 12v, battery charger 12v,bright flash light.
Ok lets get this party started, first have the battery charged over night if on a slow trickle, keep the battery cables off overnight, next put the volt meter on it black pos. set to 20 dcvolt scale, statically the battery shoukld read 12.5 volts anything less it needs to be replaced, next.. reinstall the cables and start the car...what is your reading...12.5 volts???? this is straight battery voltage and indicates that the alternator/regulator combo is not charging... cause may be a broken wire off the back of the alternator or a bad alternator, possibly a stretched and loose alt. belt.
If wires look ok and the belt tests tight(with engine off try to turn the alternator pulley by hand, if it turns the belt is way too loose or defective..tighten or replace)..then suspect the alternator/regulator...remove it and take it to Discount Auto or Auto Zone there they will bench test it for output if no good replace it.
Ok if your reading was 13.0-14.5 the alt/reg is charging, turn on all electrical is the reading on the dv volt scale at about 12.8-13.0 volts, this is shut all accesories off and it should go to full charge 14.5..all good....anything less have the alt/reg bench tested as stated above.
Ok everythibng seems to be in charging order but it still goes have a direct drain on your electrical system knocking the daylights out of your battery, ok first disconnect every mercury under hood and trunk light you find and let it sit overnight(also go around the car in the dark and see if any lights are lit such as a bad brake light switch illuminating the brake lights while you sleep thus draining the battery overnight) next morning does it start...yes then replace the mercury lights and be certain they are adjusted perfectly because they cant be seen if they come on under the hood or trunk, Ok all that and still no find...take the positive cable off the battery and in series with it install your 12v test light...needle pin in the cable alligator clip on the post or vice are now testing for a draw in the system that may be killing your battery while sitting over night,
go to the under dash fuse panel and one fuse at a time remove it... each time while it is removed check to see if the test light is on or will go off when you find the circuit that the drain is in, mark the fuse in the panel when you find it and see if you can visually observe any wiring problems in that particular circuit(have a manual handy to locate which fuse controls what circuit in the fuse panel) example if the cigar lighter fuse is pulled out and the test light goes out... look at the lighter element... we have found children who put pennies inside the cigar lighter element causing a horrible drain on the battery and very difficault to find as well.
Hope this helps in you diagnostic adventures of basic electrical 101.

on Aug 10, 2010 | BMW 323 Cars & Trucks

1 Answer

New battery, let it sit overnight and it goes dead.

You have a parasitic drain, something is on a light or a module isn't powering down . To test this you put an ammeter in series with negative battery cable an battery post . Measure currant draw ,shouldn't be any more then 0.050 milliamp's . If it is start pulling fuse's till it drops . You should refrain from taking the battery cable off with the vehicle running , Can cause a voltage spike , take out electronic components . Namely transistors . How To Perform Parasitic Draw Test EricTheCarGuy

Mar 12, 2016 | 2001 Lincoln LS

1 Answer

Why battery goes dead overnight

possible something left on. glove box light, boot light. ignition , wireless or a bad battery ( especially in cold weather) have a load test done on the battery to check for internal faults.

Dec 09, 2014 | Cars & Trucks

1 Answer

I have a 99 ford expedition eb ive had the battery n alternator tested both reading at the right volts but the battery keeps dying.... ive made sure every thing was tight n where they should be n...

If the alternator is charging the battery, and it goes dead overnight, you have a short to ground in the wiring that is draining the battery.
You can try disconnecting the negative battery cable and see if the battery stays charged when the engine is off.
If it still goes dead, the battery could have a dead cell.

Sep 23, 2013 | 2005 Ford Expedition

1 Answer

1992 ford explorer will not hold a battery charge and the alternator tested fine

Then you answered your own question
Battery won't hold or take a charge
If it is brand new, then we have to start over
& need more details
Are you saying you have a Parasitic Current Drain
overnight & the battery goes dead
That you study on the internet & test for

Aug 09, 2013 | Cars & Trucks

1 Answer

Left overnight truck wouldn't start. with charger on it ok, but left standing for 4 hours, no start. Changed primary battery still same. disconnected both negative terminals overnight and today both...

Your battery may have a dead cell, take it out and test it, use a charger and a volt meter, after the charge if the volts are still low then replace it, or you could take it to a parts store and have them test for the dead cell.

Jan 18, 2011 | 2007 Ford F-350 Super Duty XLT

1 Answer

99 mercy sable theft light keeps binking battery goes dead

you have a bad cell in your battery or a major draw on electric system. I would have the battery tested first.

May 26, 2009 | 2001 Lexus Gs 300

1 Answer

1999 Lincoln Nav 2WD. Battery runs down overnight. Battery & Alternator test OK. Someone said it was some sort of Load balancing module ?? Gilbert

there is a sensor that levels the vehicle and a has a shutoff switch in the back.turn it off and see if the dead battery problem goes away.i would wire it up so it only runs when the ignition is on.a further note,when getting oil changes tell them about it,some forget to disable it and the compressor can get damaged

May 17, 2009 | 2004 Lincoln Navigator

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