Question about 1990 Toyota Corolla

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I have a bran-new alternator. But my car still

I have a bran-new alternator. But my car still won't run on it, draining my battery. Why would this happen with a good alternator?

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  • Steve Newton
    Steve Newton May 11, 2010

    Are batt termanels clean? How about ground wires? Is alt really charging?

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  • Toyota Master
  • 14,036 Answers

CHECK ALTERNATOR FUSE + FUSE LINK TO MAIN BATTERY FEED WIRE.MAKE SURE YOUR BATTERY CABLES IN GOOD SHAPE.IF THEY ARE OLD REPLACE THEM.BECAUSE THEY WILL CAUSE HIGH RESISTANCE IN CIRCUIT CAUSE CHARGING PROBLEMS. AND CHECK ALTERNATOR POSITIVE WIRE AND VOLTAGE REGULATOR WIRE.MAKE SURE DRIVE BELT NO SLIPPING.ALSO MAKE SURE YOUR BATTERY IS 12.5 VOLTS.IF BATTERY IS WEAK ALTERNATOR WILL NOT BE ABLE TO CHARGE IT.IT WOULD BE LIKE A BUCKET WITH LARGE HOLE IN IT.KEEP FILLING IT WITH WATER IT WILL LEAK OUT.IT WONT HOLD NONE.

Posted on Jan 30, 2010

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2004 ford freestar 4.2l Not charging, new alternator tested and working new battery.


Hotrod, Recheck,clean and tighten all connections. If you say you had new alternator tested and is working OK, the new battery must be defective. With the van running, use a DVO meter and check the battery, if it shows above 14 volts then the alternator is OK, a good battery should show 12.4, that leaves either a faulty battery not holding a charge or you have a parasitic draw(something draining battery). Which would have to be diagnosed by a good Tech.
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Alternator may be faulty and not charging the battery or you may have a voltage leak to ground which is discharging the battery like a clock or radio light or some other faulty electrical component leaking power.

The alternator is the easiest to check. Does the battery go flat as you drive it? If not its probably not the alternator. You could check it with a current meter when the engine is running.

You could do the same with the battery when the engine is off to see what the current drain is. This might give you an angle on the thing which is draining the battery.

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Battery being drained & won't run? Is it starting fine or do you need jumps to start? Not sure because your explanation was vague but sounds like you may have an alternator problem.

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You would have checked the charging system before replacing the alternator, so I will assume the charging system is good.
If the battery is being discharged overnight or over a few days, you would need to disconnect it and check every circuit on the truck to find the drain.

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It sounds like you need a new starter. If you hear the starter click when you turn the key to start, replace your starter since you already replaced the battery. You might want to have your alternator checked out, or when you get your car started, test the battery terminals with a multimeter. You should have around 14 volts with the car running. If not, you will need a new alternator. The alternator won't keep the car from starting though, unless the battery was drained because it wasn't charged. Even then it is the battery keeping the car from starting.

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Sounds like an alternator. When it goes bad, your car is forced to run off of the battery , which wont last long depending on what all you have running .
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Try replacing the alternator and let me know if you have any more problems.

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