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For a battery to "Drain" you MUST have a short somewhere or the "Glovebox" or "Trunk" light is staying on etc. etc. Battery's don't just "Drain" on there own ;-) TommyTrouble

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โˆ™ 2006-04-12 15:25:52
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Q: Why would a new battery drain when nothing appears to be left on and the alternator checks out ok?
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Related Questions

Why is my 1984 alternator charging constant 16.3 volts?

If the battery checks out okay, you can replace just the voltage regulator inside the alternator.

Why does the battery light come on intermittently the alternator has been changed battery checks good the lights flicker when battery light is on and light goes out after car is restarted?

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Why does your battery die and car cut off when its hot and you have the ac on in summer time?

Because the ac uses juice from the battery, if it uses all the energy, the car wont start Just as in winter, when you have the heating on, the AC uses the heating fan to circulate the cold air. It is the fan that takes the current from the battery and if the battery is not holding it's charge or the alternator is not charging the battery then the battery will die and the car cut out. It this situation it is best if 2 checks made, if necessary, by an Auto-Electrician. They are:- 1) The battery to see if it is holding it's charge and 2) The alternator to see if it is charging. Replace the faulty components. If the car cut's out when the battery dies this suggests the alternator may well be at fault. However the checks will confirm this one way or the other. A red light may show on the dash if the alternator is not charging.

1994 Mercury Grand Marquis. The battery light stays on and causes a drain It goes out when the ignition is off Any ideas Difficult to start and stalls. Changed alternator and battery checks ok. Help?

The battery light isn't an indicator that the battery is always bad. What the light should really be is a picture of an alternator, but most people wouldn't recognize that. Have the alternator checked off the vehicle to make sure it is good, then have it checked on the vehicle, (many places like Auto Zone do this for free). If it's not charging on the vehicle, you could have an alternator fuse bad or your car might even have an inline fuse between the alternator and battery. Many Ford products have a large fusible link between the alternator and battery, and if it's bad, there is no power going to the battery from the alternator. Good Luck!!!!

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Make sure the battery is checked out under a load. This will indicate whether the battery is capable of holding a charge.Second, suspect the alternator is not charging the battery.Third, suspect a short or a switch somewhere that is draining the battery.

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I had this problem on a 1979 Mercury Grand Marquis- it turned out to be a short in the wire going from the alternator to the battery. It was intermittent, so it was very hard to run down. If the alternator checks good, the short/broken wire could easily be the culprit.Rocky_B - See my entry here for more things you might want to check:

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1996 camaro 3800 was not charging you changed the battery the alt and the belt now the voltmeter in the car fluctuates wildly from half to max and the check gages light comes on?

Sounds like something might be hooked up wrong. Check alternator wires and battery cables for good/correct connections. Check for any shorting wires (maybe something got pinched when you put the alt. in) around alt. If all checks out, maybe you got a bad alternator.

How can a person tell the different between problem with the battery and the alterator?

The quickest way to test the battery is to have it drop tested this involves using a tool to apply a load to the battery which checks it's ability to hold a charge. If the battery checks OK then the charging rate of the vehicle should be checked Both of these tests can be carried out by any good garage

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In many cases, battery charging gauge fluctuations are a symptom of the charging system not keeping up with the additional electrical demand of a blinking light or wipers or other intermittent electrical drains. I would first have the battery checked to see if it is holding charge. If the battery checks out OK, the likellihood is your alternator is failing. More than probably it is your alternator. Ya probably one of the six diodes in the bridge are open, Or the brushes to slip-ring connections are jumping (dress slip-rings and replace brushes. GETERDONE!

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What could cause a 1990 Firebird to not charge when the NEW alternator checks out to be working just fine?

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