Question about 1995 Mazda Protege

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The electrical system fails while driving

The car run fine however when replacing the battery it was put in reverse polarity and blew main fuse. We replaced this and it seemed fine for a few days. Today the car stopped running while driving and when I pushed down on the individual fuses I got power temporarily, but not long enough to move car. I'm not sure where to start looking next. I am pretty sure its around the fuse box and since the battery had been installed backwards, is there any place I can check for damage first to avoid Easter egging the electrical systems?

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I would say you have toasted your main fuse board and the only true fix is to replace it GOOD LUCK

Posted on Mar 22, 2009

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If the battery was improperly polarized (polarity reversed) you may have a lot of damage.
The main fuse isn't the last one you need to replace.
To measure them, you should have some kind of multimeter and it would help for the other tests as well.
(They can be had for <$20 US at electronics stores or, for a few bucks more, auto parts stores.
Any of them are accurate enough for home use.)

If that has happened, the alternator could well be fried; the output diodes are oriented so that they would have looked a lot like a piece of wire to the battery and while they are rated at high amperage (100 amps or so) the battery could have supplied twice that and caused them to fail.

You need to measure the terminal voltage across the battery.
Normal for a charged battery is 12.6 volts, charging at an idle 13-13.5 volts and maximum at any RPMs, ~14.3.

If the main fuse was blown, I suspect the battery was installed incorrectly.

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