Question about 1991 Ford Festiva

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Lights kill battery

Battery is good.mech says alt.is putting out enough power.works fine when lights are off.battery drains in about half hour so i have to jump car to start.please help thanks.

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Did the Mechanic check the alt.with the lights on,and also did he check amps it's putting out as well.hope this helps

Posted on Jan 24, 2009

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Posted on Jan 02, 2017

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My 98 lumina has a constant power draw from somewhere. I just replace the battery and had the alt tested (it was good). I have to jump the dang thing every morning but if I drive it enough during the day...


The alternator may charge fine but could drain the battery through a bad diode,have you checked the alt for a bad diode?Disconnect the battery positive cable.Put a regular 12v test light between the battery positive post and the positive battery cable.If the test light is bright you do have a drain,if dim it is OK.A dim light may mean the drain is internal in the battery.If you do have a bright light remove a fuse ,one at a time from the fuse box until the light goes dim.Once dim you have identified the bad circuit.If removing all fuses do not dim the light,disconnect the alt charging wire at the alt,if that dims the light,then you do have a bad diode.DO NOT create a drain(bright light) when checking for the drain by turning on the key or opening a door/trunk etc.
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What is the amp draw when the car is on accessory with nothing on. just a estimation. My car is drawing 5 amps with the key in and turned and it killed my battery?


When you say NOTHING on, are you saying no radio or interior light? No light on in the boot (trunk) and no sidelights? If this is the case then a 5 amp drain does sound a little odd.

That said 5 amps should not be a great drain on the battery. If you have a 70 amper hour battery (Obviously, I don't know what car and rating battery you have, so I just took a general stab at a Mitsubishi Charisma which has a 70ah battery) then a 5 amp drain should take 14 hours to kill it stone dead. I imagine that 5 hours would put it in a pretty poor condition and 10 hours would probably have discharged it to the point where all your lights are dim and the vehicle wont turn over on the starter motor.

It does sound like you have something draining moe power than would be expected

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You have a power drain ...and it sounds like a big one. Basically there will be a short somewhere in your cars wiring causing the power to drain from your battery, I would also check your car stereo wiring as sometimes they are the fault

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I put a new battery in my chev equinox 2 weeks ago seemed ok if I drove it every day, but if I leave it a day its completely dead, alt is charging at 14.7 volts, the only thing on is the security light on...


You need to make sure that your getting good conection to your battery. If your alternator is fine, as you stated, you might not be getting a good conection. Your alternator may be keeping your battery alive just enough when your driving. Check all connections. Hope this helps.

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Make sure he didn't put the wrong alternator in there. Sounds like it's charging too much, or shorting out somewhere. Take your starter in and have it checked.

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"it always dies if it dont drive it for 3 days or more,"

Sounds like you have a constant drain on your battery -- when engine is off the drain kills the battery. That cause is almost always very difficult to find.

" wondering if there is a specific battery I should be looking for"

In terms of the type battery, no kind is going to withstand a constant drain (if you have one) -- I'd just get whatever battery they look up at the parts store.

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if batt.gets drain while driving,charging system is not working!by comment,u knew that!u can check wiring connection at alt.for bad contact,corrosion or damage wiring,check for batt. voltage at big red wire at alt.,but these models are prone to alt. failure,if connections are ok,pull out alt. have it check at part store they do not charge for this,

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Lights killing battery


HAVE YOUR MECHANIC CHECK THE FUSEABLE LINK BY THE SOLENOID. IF THIS LINK IS BURNED THE ALTERNATOR CAN NOT SEND CURRENT BACK TO THE BATTERY. IF ONLY PARTIALLY BURNED IT MAY SEND CURRENT, BUT NOT FULL CURRENT TO KEEP UP WITH THE DEMANDS THE HEADLIGHTS PLACE ON THE BATTERY.

Jan 24, 2009 | 1991 Ford Festiva

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