Question about 2003 Mazda Mazda6

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Battery light stays on when driving, car completely died this morning wouldnt start after i had driven 6 miles and stopped at the shop, had to get jump started and the battery was tested and was ok and so was the alternator what could this be? Is this an expensive job?

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2 words, charging system. Doesn't mean go straight for the alternator though. Check your belts or tensioner pulley if you have serpentine belt. There are normally three diodes in the alternator, when 2 of 3 go out then you lose your charging capabilities and can only run until battery dies (6 miles sounds about right). Hope this helps

Posted on Sep 27, 2010

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The battery light staying on indicates that your battery is not charging either because of a faulty battery or a faulty alternator/regulator! Seek a second opinion as the diagnostic seems a bit dodgy when you have a lit battery light and your battery is definitely going flat!
If you have a multimeter, measure the voltage at the battery terminal with engine off: it should read around 13.8Volts and anything below 12 Volts is bad news!
With engine running, measure the voltage at the battery terminal again: it should read around 14.5 Volts - if it 13.8Volts or lower or above 15 Volts, you have a bad regulator/alternator.
Replacing an alternator does not require a lot of labor so it is virtually for the cost of the replacement alternator (consider getting a second hand or recondition unit - under $100?).
In all case, always clean up the battery terminals and clean/retighten all battery and alternator cables and terminals.

Hope it helps.

Posted on Sep 27, 2010


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