• Tiny
  • want2work209
  • 1999 Mazda RX7

Electrical problem
1999 Mazda RX7 4 cyl Front Wheel Drive Automatic 195000 miles

MY car battery keeps dying I replaced my alternator and just got a new batt on fri on i't sun and it was dead this moring. I tested the alt when the car is running i'm getting 13.5v so i'm assuming the alt is working i'm out of ideas and money

Sunday, July 4th, 2010 AT 3:04 PM

1 Answer

  • Tiny
  • caradiodoc
  • Expert
  • 25,273 posts

Hi want2work209. Welcome to the forum. 13.5 volts is not ideal but it should be enough to charge the battery enough to start the engine. You might find the voltage creeping up as the battery becomes charged. It should be between 13.75 and 14.75 volts.

If you can drive all day with no problems, then the battery is dead the next morning, look for something not turning off and draining the battery. A glove box light, trunk light, vanity mirror light, and cell phone charger are common causes.


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Sunday, July 4th, 2010 AT 3:41 PM

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