Question about 1995 Ford Mustang

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Batterie is drained when i get up the next morning to start it up

I have replaced my car batterie 3 times this year. what could possibly be draining the batterie when it sits overnight. i replaced the altinator, disconected the radio. the car runs great when i'm driving it and when i go into the store and shut it off it fires right up. this **** only happens when i shut it off for the night.

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  • gearjammer32 Jun 08, 2008

    hey jasonvwmech, Thanks for your help. My buddy and I found out the mach 460 amp on the passenger side under the deck lid was draining my batterie. Now my next question is why? thanks again, gearjammer32

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Might not be helpul, but do u have any lights that u are unaware of eg boot, glove compartment , under hood etc

Posted on May 26, 2008

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Well for starters make sure your battery is fully charged disconnect battery ground(-) ,connect a test light between negative(-) terminal on battery and the ground strap you removed from the battery, if the test light lights up then you have somthing draing your battery. start by removing fuses one at a time if the test light goes out after that fuse is removed that is the source of the draw killing your battery.If there are no faults found at fused circuits start disconnecting wiring connectors from the nonfused circuits ie starter,ignition,alternator,cooling fan.If the test light does not light up at all when connected let me know for the next step

Posted on May 26, 2008

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1 Answer

06 bug drains battery over night


On most 12v cars,the #1 cause is a light left on somewhere in the vehicle.#2 cause is a bad diode in the alternator and #3 is a bad battery which self discharges and is usually over 5 years old.
An easy first step is to disconnect the charged battery over night.If it still has a full charge the next morning,after you reconnect it and if the car starts,you can rule out the battery as the culprit.Now,if the battery passed the first test,now we go onto #2 test and disconnect the alternator output wire from the alternator overnight.If the battery still has a full charge the next day we will now know the alternator has a bad diode and will need to be repaired/replaced.If the battery was found to be low on charge the next morning with the alternator disconnected we will now have to go on to test #3 to find the drain in the vehicle. Disconnect the positive battery cable and place a 12v regular bulb type test light between the positive cable and the battery positive post.You should have a bright light on the test light if you have a drain in the vehicle from the battery.(don't worry about a dim light as electronics need a little memory voltage) We are looking only for a bright light.With the key off (as it would be overnight) you are now going to remove one fuse at a time while watching the brightness level of the test light.Take one fuse out, look at the light and if no change in brightness put the fuse back in and on to the next fuse,one by one until you see the light go out or dim.The fuse that dims or removes the bright test light will be the circuit that is draining your battery.Now you have your "battery drain" circuit identified and can inspect/repair the item/items on that circuit.
REMEMBER an open door,trunk or hood may cause a FALSE bright light on your test light because of courtesy light switches and alarm switches so manually close those switches if you need to keep one of the doors or hood/trunk open to gain access to the multiple fuse boxes in many vehicles.
DO NOT TURN ON THE KEY during this test, as all power to the vehicle is now going through the test light and things won't be happy if you do.

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What possible way can check to tell if my overnight battery drain is due to the diode sticking? Is there a test or a tip you could offer? The battery is new and the alternator tested ok.


A diode doesn't "stick". Either one of your circuits is using battery overnight, the battery is defective, or it's not charging.

Assuming the battery is "good", pull all of the fuses overnight. If it's good in the morning, put all the fuses back in, and next night leave one in. Next night, the next fuse, etc.

Once you know which circuit is draining your battery, you can troubleshoot further.

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This should be done with everything turned off and the door closed. with negative battery disconnected. place 12 v test light between the battery terminal and the cable end.(on neg. side) if the light lites up there is a drain. remove one fuse at a time until u see the lite go out. that is the sytem the drain is on. usually glove box light or trunk light or visor light left on or stuck on.

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HELLO CHARGE THE BATTERY UP AND START THE CAR AND PULL THE POSTIVE CABLE OFF THE BATTERY IF IT SAYS RUNNING YOUR ALTERNATOR IS WORKING BUT IF IT DIES THE ALTERNATOR NEEDS TO BE REPLACED

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