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Lead acid Car battery was charged with polarity reversed. Can it be re-charged correctly? It blows the charger fuses??

Posted by Angus Clarke on

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Bill Boyd

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  • Cars & Trucks Master
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A lead acid will not charge with the polarity reversed
What happens is that in dead shorts and can destroy the battery
it can blow up the battery , blow the charger fuses and destroy the charger
Depending on the damage to the battery cell plates it may be recoverable

Posted on Mar 30, 2018

5 Related Answers


  • 32 Answers

SOURCE: reversed polarity on 2000 mazda millenuim, now my car wont start

who ever made the new battery has accidently mad eit with reversed polarity there is a way of changing this i think you just charge it with the reverse polarity minus to positive ect

Posted on Sep 01, 2009


  • 3085 Answers


Buy the removal keys from eBay or have a car stereo shop loan you the keys.

Posted on Jun 14, 2009


Dennis Mulford

  • 1055 Answers

SOURCE: Cloudy battery acid.

youve got a bad cell in the battery replace the battery!!!!!!!

Posted on May 20, 2009


  • 62 Answers

SOURCE: hooked up the battery reversed polarity. Blew the fusible link but replaced it. Now the car will crank but not start.

start checking fuses hopefully its just another blown fuse if your lucky

but if all the fuses are good, you probably fried something like the computer or ignition module and probably the radio

hopefully its something simple and cheep but don't be surprised if you have to shell out some cash to replace the computer

Posted on May 16, 2009


  • 1489 Answers

SOURCE: Charging problem.. Wont charge battery

The instructions for installing a new alternator usually read to fully charge the battery (12.3 - 12.8 volt range). Otherwise, the alternator will be damaged when it initializes. I have seen some extreme damage result from installing a new alternator with a low-charge battery. The torque required to turn an alternator when damaged in this scenario is unbelieveable!

Posted on May 02, 2009

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Related Questions:


Why is my 2007 Sebring 2.4 ignition switch headlight switch causing total power loss when put under load?

Chrysler Sebring 2.4L
well battery good first, not any of that you posted
12..6vdc charged, rested volts,. 13 to 15vdc riunning
car is dead, I presume.
voltage drop is easy to diagnose using any $15 up, DMM meter..
The TIPM is not plug and play on most cars so now a new added problem , omg hard to solve.
some places sell TIPM pre programmed to specific VIN # cars.
got that?
head lamps run with KEY off and if not that is what we fix
fix simple first and then luck out on all other vastly complex problems solved
the computers (PCM/TCM/BCM/TIPM)_ love to go nuts below 10vdc. so learn to use a voltmeter first makes sure power is 12vdc not 10.
head lamps connect to BUSS, 12vdC hot at all times..
all fuses must be good, (ohms zero in hand)
if not comms can be lost , crashing the card house.

your battery test is a hard fail,and has zero to do with TIPM
the battery must be charged, and load tested good. this is first.
that takes 2 tools , charger/load tester 100amps.
lacking that take battery to store get it tested.(free of cost)_
ok battery is now good,(i pretend now ,.here x)
  1. the battery has 2 cables Plus and minus and 4 end lugs.
  2. the lugs must never be reversed of BOOM, !
  3. the 4 lugs all 4 must be rust free and tight.
  4. the ground cable end (minus) must not go to the body ever direct or BOOM. it goes to starter bolt or direct to engineblock massive metal. or BOOM. (starter is 300 amp load see?)
  5. the PLUS cable goes to outboard starter LUG, only
  6. yes all cars have body to engine bonding strap, that is blow to H3LL , battery ground, hooked to body, oops bad acts blew it up;.
use the DMM correctly (dmm dial to volts DC.)
connect the meter to battery NEG lug (black test lead tip)
connect read lead to engine, metal..
meter reads zero
key on, meter reads zeo
of not below 0.5vdc (ground spec) grounds are NO GOOD .
now put meter red wire end to PLUS lug battery
12.6vdc is charged, battery if not this , charge the battery for 4hr to 8 hours 10 to 15amp chargers are best. charger it
the let it site for 1hr,and 12.6vdc is charged bat.
this test is called SOC,state of charge test, on all lead acid batteries.
that was just 2 tests of many
but since your battery test failed, there is no way to advance
and do stop throwing parts.
use the meter first.

1 more point
do not replace any starter or alternator with battery lug MINUS connected or blow up huge 100amp fuses or worse those hard to find 100+amps FUSEIBLE links.
when those blow up the TIPM will be dead. useless.

learn to use a real schematic for this car. and find where power is lost not guess ever. use the meter

2004 kia sorento no spark no sound from the fuel pump. This happened after i disconnected the battery to charge it. Can someone tell me what the problem is Please .

It looks like there are 2 black cables on the positive battery terminal make sure they're connected, did you connect the charger correctly? If battery polarity is reversed for even a nanosecond the many fuses in the under hood fuse block will be blown no matter that's the next place to look, check all the fuses I am sending you a diagram. I hope this helps. Take Care.

I have an older charger that may have been hooked up backwards when it was new, when I hook up multimeter readings say it’s working fine, but when hooked to battery it sparks like I’m hooking it up...

You didn't say what sort of charger and what it is you are trying to charge - this is the cars and trucks section but it would be too easy to assume you are asking about a charger for car batteries.

The multimeter should clearly indicate the polarity of the wires or plug and verify your assumption it is incorrectly connected internally.
It isn't unusual that a discharged battery causes a spark when being connected to a charger the right way around and it isn't unusual that a completely discharged battery will demand more current than a charger can provide causing a modern intelligent charger to shut down, similarly a defective battery can spark when connected...

If the charger is really wrongly connected internally it shouldn't be very difficult to rectify with most designs and if you provide more information in the comments I can try and advise you further.

Just as a matter of diverse interest, with lead acid batteries maintaining correct polarity is very important as when completely discharged it is possible to recharge them with the wrong polarity and when attempting to reconnect such a battery, it will immediately destroy many of the electronic circuits it supplies...

What is the chemical reaction that take place in the lead acid battery?

the sulphuric acid reacts with the lead in the plates with the result that the acid breaks down and tends to go water and the lead becomes lead sulphate
when a battery is dead flat, the plates are all lead sulphate and the density of the acid is approaching that of water
that can be tested with a hydrometer
When a charge is applied to the battery terminals , the process is reversed and the lead sulphate returns as lead and the water ( low ph acid) returns to sulphuric acid

Car battery corroded, terminals white. Jumped car but doesnt rev. Must it be alternator or could a dud battery suck the juice from alternator to stop car reving?

I would take the battery out and have it checked, or, you might want to invest in a modern battery charger that can also check the charging system as well as desulphate lead acid cells.

The charger blows the 3.15a/250v slow blow fuse the second I plug it in... what can I do to get the charger working again?

check that you have the red lead of the charger on the positive terminal of the battery and the black lead on the negative terminal of the battery. Next check the voltage to be charged is selected correctly 6 volt or 12 volt. next check the rating of the fuse used as 3.15 amp may be too low for the charger. I would not go greater than 5 amp at best. Lastly have the charger checked by an accredited electrician for internal shorts.

Golf battery polarity

reversed polarity,check fuses. check the system for burnt wires also !
Always hook up your battery terminals correctly, as the alternator may be damaged if the battery is hooked up backward. jump start car, if it will. there should be at least 13.7 to 14.2 volts at battery posts while its running. if alternator is ok.

When I use the cigarette lighter to charge my cellphone, the battery actually DIScharges in the phone. Can this be due to reverse polarity at the lighter outlet?

no, if it was it would blow a fuse when phone is plugged up. maybe a bad charger . can you try it in differe..nt vechile to see if it does same thing

There is steam and a strong egg smell coming from the battery. What is the problem?

This is a high charging on the battery, as it is overcharged . this can be failure of the alternator rectifier or the regulator.
so use a voltmeter and confirm the voltage range to rectify the fault.
A high charging of this nature can damage the battery in the long run.

Battery charger on 2008 Chevrolet Equinox

most chargers have a few different settings you want to put it ona slow charge for about 4-6 hrs bye slow charge I mean it should have a 2amp or a3amp trickle charge unless you are attempting to start the car immeditly the you will you the setting labled starting
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