what is drining my battery

1994 MERCURY MARQUIS

100,080 MILES

TROY HARDY

MEMBER
1 POST

everthing works ,radio dosen't and car want start, put new battery in change neg wire post still same problem im being told that all is a 100%, ive even been told to get a new battery. but still have not been told why this keeps happening every week or if lucky every two weeks

Mar 9, 2012 at 7:07 PM

MERLIN2021

✓ASE Certified Mechanic
17,250 POSTS

Get an analog voltmeter remove the negative battery cable, attach the Black lead to the battery post, Red lead to cable end, then pull fuses one at a time, make sure there are no accessories or lights in the on position, Key off! Close the door have someone in the car, pull fuses one at a time after each fuse check meter, when you pull the fuse for the bad curcuit, the meter will drop to 1 volt or so. Check all fuses, even under the hood. If meter does not drop, remove the battery connection from the alternator, if it drops now, the diodes are bad in the alternator. Put the fuse back in were it goes as you go so you don't forget which fuse goes were! Wait several minutes after hooking up the meter before pulling fuses, test with a good battery!
https://www.2carpros.com/first_things/why_is_my_car_battery_dead_over_night.htm

Mar 9, 2012 at 7:08 PM

CJ MEDEVAC

✓ASE Certified Mechanic
11,004 POSTS

OTHER THAN DRAIN.....MAYBE IT'S A CONNECTION PROBLEM, SOMETIMES THEY GET INTERMITTENT...CORROSION, EXPANSION AND CONTRACTION (TEMP), MOVEMENT, OR A COMBINATION. MY LINK MAY AID YOU. SEE MY ANSWER ON JANUARY 5TH

https://www.2carpros.com/questions/1994-jaguar-xj6-ignition-key-turned-car-doesnt-crank

YOUR TURN

THE MEDIC

Mar 10, 2012 at 3:49 AM

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