Why would my car not start after putting the battery backwards?

i put in the battery of my car backwards and then i tried to start it but it rotated then nothing happen and it will not start after changing the battery and putting it in the right way. feed back would be great thanksWhy would my car not start after putting the battery backwards?That probably killed the microcontroller, which is the computer in the car that controls everything from air to fuel mixture, to anti-lock brakes, or any other special features your car has. Your best thing to do would be take it to a mechanic who can test the computer, engine, alternator, and probably everything else under the hood. Most likely it will just be the computer got fried when you put the battery in wrong. Microcontrollers can be very picky to how the electricity is delivered and how much so it would make sense if it killed it. A new computer in your car may cost around 200-500 depending on how many features your car has, and how hard it is to replace.

Hope this helps, and be sure to double check in the future to prevent this from happening again.
Why would my car not start after putting the battery backwards?
Probably fried the main fuse.



All else should be protected if this is a newer car.
Why would my car not start after putting the battery backwards?
Maybe burned up the solenoid on the starter, a fuse or two or both. Have someone look at it.
fusible links are gone
you wound the engine too tight backwards. now you must roll it backwards down a hill
your systems are protected by relays, fuses,and switches.these funnel through sensitive diodes,and caps,etc to condition the power.when you reverse polarity,all the above is bypassed causing nasty situations, and direct grounds to the systems.good luck with that.red is +,-is negative.also using an ac welder,always unhook the battery.
It shorted the system, burned starter or fuses. have a good electrician check it. Hope this help!
A battery is a device that converts chemical energy into electrical energy. The basic design of a battery includes two electrodes, an anode (the positive end) and a cathode (the negative end). In between the battery’s two electrodes runs an electrical current caused primarily from a voltage differential between the anode and cathode. The voltage runs through a chemical called an electrolyte (which can be either liquid or solid). This battery consisting of two electrodes is called a voltaic cell.
The first inclination that an electrical pathway from an anode to a cathode within a battery or in this first instance “a frog” occurred in 1786, when Count Luigi Galvani (an Italian anatomist, 1737-1798) found that when the muscles of a dead frog were touched by two pieces of different metals, the muscle tissue twitched.
This led to idea by Count Alessandro Giuseppe Antonio Anastasio Volta (Feb. 18, 1745- March 5, 1827), an Italian physicist who realized that the twitching was caused by an electrical current that was created by chemicals. Volta’s discovery led to the invention of the chemical battery (also called the voltaic pile) in 1800. His first voltaic piles were made from zinc and silver plates (separated by a cloth) put in a salt water bath. Volta improved the pile, using zinc and copper in a weak sulfuric acid bath and thus invented the first generator of continuous electrical current.
The batteries we use today are simply variations of the early battery or voltaic pile. Today’s battery’s are made up of plates of reactive chemicals separated by barriers, being polarized so all the electrons gather on one side. The side that all the electrons gather on becomes negatively charged, and the other side becomes positively charged. Connecting a device creates a current and the electrons flow through the device to the positive side. At the same time, an electrochemical reaction takes place inside the batteries to replenish the electrons. The effect is a chemical process that creates electrical energy (electrochemical energy).
Now with this backdrop let’s look more closely at one popular battery – the iPAQ Battery 167648 and use this battery as an example of how an electrochemical reaction is occurring inside the battery to create power. Most batteries function in a similar fashion so this example should provide a basic back drop.
You can see a picture of the iPAQ Battery 167648 at: http://www.batteryship.com/htmlos/htmlos…
The technical specs are:
? Polymer Lithium
? 3.7 volts
? 1600 mAh
? 100% OEM compatible. IPAQ 167648 Battery is guaranteed to meet or exceed OEM specifications.
? Integrated Power Management Circuits - protect against over-voltage and under-voltage conditions and maximizes battery life between charges, minimizes charging times, and improves overall battery life.
These specifications are actually the measurements of some of the technical operations that are taking place inside the iPAQ 167648 Battery while the battery is powered and they quantify the energy that is used to power your iPAQ 167648 Battery.
The iPAQ 167648 Battery is the power source for the iPAQ 167648 PDA. The iPAQ 167648 battery converts chemical energy into electrical energy and that conversion is the basis of the energy formed to power the iPAQ 167648 Battery and device.
Inside the durable casing of the iPAQ 167648 Battery is an internal system design that includes two electrodes, an electrolyte, plates of reactive chemicals, and a dry cell.
Working in concert with each other each of these parts perform a specific function: to create electrical current to power the IPAQ 167648 Battery and device.
Let’s look closely at the internal design of the iPAQ 167648 battery.
The two electrodes contained within the iPAQ 167648 battery are the anode and the cathode. The anode is the positive electrode and it is where oxidation occurs. During oxidation oxygen is added to the electrode which causes the removal of electrons from the specific chemical compound (e.g. lithium). The cathode is where reduction (gain of electrons) takes place. A Redox reaction is one where electrons are gained from an oxidizing source. In the iPAQ 167648 Battery it is in the anode that oxidation occurs to pass electrons to the cathode.
The passing of electrons from the anode to the cathode is passed through an electrolyte. The electrolyte is a gel-like polymer film that does not conduct electricity but allows ion exchange. The dry polymer electrolyte design offers simplifications with respect to fabrication, ruggedness, safety, a razor thin-profile geometry, and enhanced conductivity. The electrolyte is held within a dry cell which is a galvanic electrochemical cell containing the pasty electrolyte.
As electrons pass through the electrolyte we can measure their volume in amperes (Amps) at a rate of one Amp to every 62,000,000,000,000,000,000 electr
You probably blew a fuse controlling something important, like the car's computer or the ignition module.

Check EVERY fuse in the car. You almost certainly blew the alternator fuse.
Depending on the year and make, you may have fried all the electronics.