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Have the same problem... Check battery its 84%. Ceck fuses thought it was somewhere there. Guess not. Just happened today,, 4x4 lights on an radio shuts off n on when voltage peaks.. Turn off car.,. Wait a minute. Back to normal,,, figure it is alternator.... Time to find a good one.. I seen DIY here for earlier model,,, how hard is it to change it. Any diy for 4.8is before i end up paying my stealer looks hard from looking inder the hood from youtube video not bad. Mechanic charging 2.5hrs labor,,,
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Call Me For Tires: 732-421-6931
Past
2000 E46 325i
2006 E53 4.4i Sport 
2006 X5 4.8is 
2011 E90 328xi
2011 E71 50i Fully Loaded :thumb up:
Current
2000 E39 528i
2013 F10 M5
2013 F10 535xi
2017 X3
2017 Sedona
2017 Optima
2016 Fiesta
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