Question about 2001 Hyundai Santa Fe

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I hooked up a new battery backwards now vehicle will not start

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Thanks for choosing FixYa and welcome to the site. I hate to hear that this has happened to you. This is the thing. Because the battery has been hooked up wrong, you have electrical issues for sure on the vehicle. When you deal with electrical issues on a car, it is a pain in the neck. Also, they are very hard to pinpoint when they are damaged. As you know, they are a lot of wires in your vehicle. Here is the thing though. You have a major problem likely because you have fried some things. And to be honest, it could be anything. I am sorry for saying this but it is true. Your vehicle needs air, fuel, and fire to start. Your ignition system is a complicated system that reads precise measurements of air, fuel, and fire to start the car. You really need to have it scanned at a diagnostics shop. They can put it on the computer and find what all is wrong. More then likely, it is a few things. The computer may be fried. If it is close to the battery, it probably is. Almost all parts are electrical. I am sorry for the bad news but this is your best bet. Even for a professional mechanic, without a machine, it is like finding a needle in a hay stack. You can check your fuses and see if any has blew for now. If you have any questions, let me know. Thanks for using FixYa.

Posted on Mar 30, 2011

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Ground goes to the - pole. Hooking it up backwards can damage your alternator, wiring harnesses and fuse links. (Fuse link damage is a nightmare to sort out!) What you do by hooking up a battery backwards is turn your vehicle wiring harness into a giant heating element. (<-Very bad!) If you just changed the battery and then you hooked up the cables with the smoking cable result you certainly did connect the cables backwards. The ground cable... will connect to chassis and in most cases the engine body / transmission somewhere.
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If you have a newer audio system you will have lost your radio codes. We can not provide the codes for anti-theft reasons. Activation Codes must be from the car dealer or audio system retailer.
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