Question about 1997 Ford Taurus

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Oooopppssss...... i acidentily hook my battery up wrong and something bad happen did i blow my computer of fuses... now its just the heat that stays on all the time and no lights in the digital stero and dash won't show can i replace fuses or cpu can anyone help...

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Check all your fuses first. Also check fusible links if equipped.

Posted on Feb 02, 2009

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I hooked the battery cables up backwards and it blew the magneto hooked the cables back the right way and it blew the magneto again the model#21R707-0011 10.5hp 344c


This doesn't sound like a car, but more like a riding mower or something.

Anyway, is it the magneto that "blew" or a fuse for the magneto? You don't mention that you replaced the magneto....

Some manufacturers incorporate reverse protection diodes that are supposed to cause a fuse to blow if the battery is hooked up backward. Unfortunately, the diode often becomes a short circuit when this happens and would explain why a primary fuse would blow again, even when the battery is hooked up correctly. If you have a wiring diagram for what you're working on, I'd suggest checking for a diode connected near the battery cables. If you don't have a wiring diagram for this, you're probably going to need one.

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Hooked battery up the worng way


Hooking up the battery backwards causes a surge that blows the engine main fuse.The main fuse is usually found in the engine bay's fuse box.
If your lucky you blow many fuses. But alot of the times every electrical component will puff magic smoke and will need replacing. Especially the Computer, Radio and Body Control Module.

Now What to do.Click the link below for step by step troubleshooting:
http://carrepairworld.blogspot.com/2016/06/hooked-car-battery-up-wrong-way.html
This will help.

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What happens if you blow a fuse?


A fuse is a safety device. It will protect the circuit from damage or a fire. If a fuse blows, it is an indication that something is wrong or something was done wrong. Try replacing it and see what happens. If it blows again, then you will need someone to troubleshoot the problem before replacing the fuse. Good luck!

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Hello Glen, Bad bad things can happen when you hook up a car battery backwards. If your car has a high quality electrical system it might only blow out one or two main fuses. If not, it can cause havoc on the wiring system and burn out the alternator, computer, sensors, modules, and stereo system to name a few.

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If you are lucky the main fuse from the battery, in the underhood fuse box will blow. Follow the small positive battery cable to the fuse box, it is attached to that fuse.

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Wrong battery? What was wrong, voltage, size, terminal location. I am not familar with a Lexus does it have two batteries? If you hooked up two batteries and did something wrong, like hook them in series some way then you could have fried the computer. It is really hard to determine what problem you have. The bad fuses should tell you something what did they run? Please rate my answer.

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Why was the battery replaced? Theres no reason the the 100 amp fuse to blow unless the alternator is shorted or you hooked up the battery backwards. I think the 100 amp fuse goes to the alternator. If it was hooked up backwards then you may have engine computer damage.

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1 Answer

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