It;s either a bad alternater or battery connection. Check battery connection first. If that isn't it go to auto parts store. Most of them will check your battery & alternater for free.If it's the battery, most of the stores will install it for free( I usually give them a 3 or 4 dollar tip, it's worth it). If it's the alternater, buy a new one,usually under $100. Some auto parts stores will lend you the tools to replace it. Normally takes less than 30 minutes to do it.
SOURCE: 1998 Ford Explorer
had same problem when my rear wiper motor went out. I had to locate all the rear wiper motor fuses and take them out to stop it. Am now waiting to replace my wiper motor.
SOURCE: '91 honda accord battery light on with new battery.
either your alternator has gone or your fan belt is not there which helps the alternator to charge the battery get a volt meter on your alternator to see if it is kicking out what it should be
SOURCE: 2004 Toyota Tundra 4.7v8 will not stay idle'd
Take the battery to autozone and have it checked.It could have a dead cell.
SOURCE: 2000 Dodge Ram 1500 (V8 5.2L) will not start
could be the battery, sometimes all the electrical would stay on but the battery doesnt have enough juice to crank the car over, if not check the alternater.
SOURCE: Flickering lights. The interior and exterior
I would check and clean the wires going to your alternator first, to be sure, but you probably have a bad diode inside the alternator. Depending on where you live you may be able to get it checked out at a place like Autozone but it will have to be checked when it is acting up or it may check okay. If there is an auto electric repair shop in your area you can get them to check and repair it. Repairs should be about $50 to $60 if its the diodes. Hope this helps.
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