Question about 1990 Oldsmobile Regency

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Brand new battery, alternator checked out good but charge drains overnight. Help please I don't know where else to look.

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  • Oldsmobile Master
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Pull interior light fuse and the clock fuse, then disconnect the NEGATIVE battery terminal, and place a volt meter in between the terminal and the cable... There should be very little current. You can also wire a light in between the batt and cable, if no voltmeter is available.
Most common issue is diodes in the alternator. Alt can test okay on some tests, and still have an issue. Failed diodes leak power to ground.

So, keep disconnecting stuff until you get no voltage at the meter or light in series with the battery and cable...

With this method, you should be able to find the culprit.

Posted on Sep 12, 2010

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Clearly something is draining the power.

this may be helpfull
http://www.wikihow.com/Find-a-Parasitic-Battery-Drain

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You would have checked the charging system before replacing the alternator, so I will assume the charging system is good.
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nancycmixon, When you see this "check your charging system" you need to have the alternator checked. This is the main component for the charging system. A normal alternator will put out 13.6 to 14.6 volts. A few tenths of a volt either way won't mean too much but if they are extremely over or under these values means you have a bad alternator. I believe that your vehicle has a voltage meter in the dashboard and it will usually read in the thirteen to fourteen volts range. As far as your battery losing its charge overnight means that you have another problem and that is you have what is called a parasitic drain. There are a certain amount of parasitic drains already in the car with the radio memory and maybe a clock that constantly displays the time and the antitheft system in the car. These will not drain your battery overnight. You have something else draining your battery that is your problem. Have the alternator checked and mention the battery drain. There is test for this but it is too lengthy to post here. Sorry about that. Good luck with this.

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My battery is brand new and my alternator is new both in good working condition but somehow overnight my battery drains.Even after a full charge in the morning i would have a dead battery. help me


you are looking in the wrong place. something is draining the battery while the ignition is off. replacing the battery and alternator is never going to fix this. you have to have someone troubleshoot the electrical system and figure out which doodad is killing the battery. usual
suspects are lights which aren't noticed as in the trunk and glove box, the anti-theft and door lock systems, remote start, clocks,etc.

One of those buggers is draining your system, you have to find it and kill it.
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