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Electrical problem...no start ..no run V70-XC70 1998

posted by  Jac912 on  Tue Oct 24 14:57 CST 2006
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last visit: Sat Oct 18 10:43 CST 2014
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Killed my old interstate battery the old fashioned way .. listening to NPR sunday morning in the driveway. Bought a new battery that afternoon and drove around with no prob monday and tues morning. Went to start it tonight and the battery acted dead. Needed a serious jump from my 240 ... jump from my garden tractor wouldn't do it. After starting and idling for a few, putting on the lights will stall the engine. Re-jump start and try again ... same result ... actually put the car in reverse and it stalled with foot on the brake. Noticed headlights get brighter with higher idle speed and go dim as the car stalls. Tested the new battery at AutoZone and it checks good according to them. What think you fellow brickboarders? Volt reg., Bad positive lead? Oh almost forgot. Pos terminal had powdery corrosion after only 2 days.
Jim in Ma.








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    Probably Alternator V70-XC70 1998

    posted by  someone claiming to be cn on  Mon Oct 30 16:49 CST 2006 [RELATED]

    An old-fashioned way to see if the alternator is bad:

    With engine running, disconnect the ground lead to attery for about 2 seconds, if engine dies, then the alternator is gone.
    The reason is: when engine running, even without a battery, the alternator provides the current needed for spark.
    Now w/o the battery, if the alt is good, no problem.
    Now w/o the battery, if the alt is BAD, no sparks, engine dies.

    Do not disconnect the ground cable too long (a very very very small risk of spike that can affect electric system).

    I have performed this test many times on many cars (Honda, Volvo, BMW) and everytime it accurately diagnose the alternator to be the CULPRIT (if engine dies when gound cable disconnected and the alt is truely bad).

    cn







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