Question about 1995 Buick Regal
Every six months or so my '95 Buick 3.8, the battery stops being able to start the car, and it always test good but if I put a new one it, the car will start (well for another 5 months or so) anyone have any ideas, other then faulty batt. and alt. I've had it tested and nothing ever tests wrong. Also anyone have any ideas how a batt. that won't start a car, could test as a good batt. it is obvious that it isn't making the cranking amps.
Test the starter for crank pull ampage
Posted on Oct 19, 2010
Hello! When you say the battery "test good"; What type of test was performed? Was it a cranking power test...How long do you hold the key in the start position? Does it start immediately or does it take several seconds? Does this amount of time increase as time passes?
If a voltage drop is present on the + battery cable or ground cable that supplies the power to the starter motor...More than normal cranking amps will be required every time you start the vehicle in that your holding the key in start longer because the voltage is below +12...A point is then reached where the battery is not capable of supplying enough current to overcome the voltage dropped on the cable or cables and the vehicle will not start...When the battery is tested for cranking amps the voltage drop is no longer present and the battery could very well "test good"...
Disable the ignition...IE...pull the starter relay...Using a volt meter set on 2 volt scale...Place the positive probe on the +battery post...Place the negative probe on the + battery connection on the starter motor...Crank the engine (15 seconds)...You must read less than .6 volts...Do the same on the - battery post to the starter motor housing...Crank the engine...You must read less then .3 volts...
If readings are above normal you've located the fault...Poor connections from the battery to the starter motor...
Let me know what you find.....Guru..........Saailer
I’m happy to help further over the phone at https://www.6ya.com/expert/david_6df67de3b14de867
Posted on Jul 05, 2010
Ok, if the cranking amps is like 70AMPs or 100 AMPS as measured by an inductive ammeter on the battery cable when starting, and it does NOT start, then it's a bad starter.
However, if it does start, that's normal.
On a car that old, I would check that the battery cable ends are squeaky clean, wire brushed, or even replaced if cleaning is not possible.
Usually, a battery that is tested good will be good under a load test.
Also, try to use an ammeter to find out if there is a drain on the battery above .2 A while it sits there turned off. This could lead to a solution if you investigate where a short may be.
Posted on Jul 05, 2010
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Posted on Jan 02, 2017
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