Question about 2005 Dodge Caravan

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Battery or altenator

Took to local auto zone , they said battery to low to test and said to charge and retest , then also said bad diode in altenator , could the bad low battery give the altenator a false reading i much rather replace a battery than an altenator

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  • garyandangie Jan 07, 2009

    while driving down the road the lights will blink and like if you was to roll up a window the light will dim as well when you roll the all the way up



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With the engine idling, check the voltage at the battery terminals. if its between 13 and 14.6 volts the alternator is probably ok. If its below 13V you need a new alternator. above 15V same thing.
Why did u think it needed repair? is your battery not holding a charge?

Posted on Jan 07, 2009

  • Tim Higgins
    Tim Higgins Jan 07, 2009

    with the engine idling, check the voltage at the battery terminals. if its between 13 and 14.6 volts the alternator is probably ok. If its below 13V you need a new alternator. above 15V same thing.

    Why did u think it needed repair? is your battery not holding a charge?

  • andrew feilds
    andrew feilds Dec 15, 2013

    wont turn over



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What are bad alternator symptoms?

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suggest that you visit your local auto zone or advance auto to have them check your altenator and battery.the test is free of charge.sounds like you have a bad regulator in the back of your altenator or maybe your battery's going bad. thank you for choosing!

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check the altenator with an VOLT/OHM METER
If you do not have one any auto parts store like Auto Zone sells these at a cheap price. Now that the red and black probes and place them on the battery, red ond positive Black on Negative. the meter has to be set on the DC mode. Make very sure of this so the meter doesn't not short out. With the engine running you should get a reading if 13.5r volts if the altenator is working. Now to check the diode on the working altenator. Reverse the probes while the egine is still running. If the same reading is shown the diode is bad letting the current reverse itself causing a no charge to the battery. Diodes are for letting the current to run one way which is called Direct Current. If the current is going both ways while the engine is running the battery never receives a charge.
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