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Old 04-21-2009, 11:24 PM   #1
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Battery Drain Problems

On my 97 Cobra I have put a new battery and terminals on the car and after not starting or running the car for a couple of days the battery in dead, any suggestions. Is there something that could be sucking the battery down that fast, I had a 96 GT that did the same thing. Is there something specific with these SN95 cars? Thanks.
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Old 04-22-2009, 12:13 AM   #2
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Re: Battery Drain Problems

I don't remember any problems on mine. Are you blowing any fuses? What aftermarket things have you done? Anything electrical, even a radio?
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Old 04-22-2009, 01:39 AM   #3
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Re: Battery Drain Problems

Bad alternator maybe?
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Old 04-22-2009, 01:49 AM   #4
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Re: Battery Drain Problems

u definitely have a drain somewhere, did it just start this?
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Old 04-22-2009, 03:33 AM   #5
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Re: Battery Drain Problems

The first thing to do will be to check all your fuses including the ones on the engine compartment.
How do you know its the battery? have you tried to turn you lights with the car off? cuz it could also be your starter
I also have that problem with my car the first problem was the aftermarket alarm cuz it was connected with the ignition system it could be that too the ignition system.
If you have an aftermarket stereo make sure you have an expert to check the wires cuz maybe one of them was connected wrong or is making a false ground. make sure you don't have loose wires..
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Old 04-22-2009, 02:32 PM   #6
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Re: Battery Drain Problems

Everything is stock, no radio or alarm system added no blown fuses. My GT would do the same thing, when I sold it I took the battery out of the Cobra and put it in the GT and rolled it. I had to buy a new battery so I put the new one in the Cobra. Now it sits in the garage and gets driven maybe once or twice a week and the battery is dead. It will jump right off. The alternator is good, after a 30 minute drive it will charge; even the volt meter will come back down after it is charged.
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Old 04-22-2009, 02:48 PM   #7
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Re: Battery Drain Problems

Have the battery tested for a bad battery cell.
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Old 04-22-2009, 03:04 PM   #8
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Re: Battery Drain Problems

IF you don't want to pay to have it fixed get an Olympia battery a gel one... also already told take the battery to autozone they will do a free check on your batt and alternator...
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Old 04-22-2009, 03:21 PM   #9
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Re: Battery Drain Problems

I have load tested the battery after charging it and the battery is fine it is something in the car that is draining the battery
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Old 04-22-2009, 03:29 PM   #10
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Re: Battery Drain Problems

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IF you don't want to pay to have it fixed get an Olympia battery a gel one... also already told take the battery to autozone they will do a free check on your batt and alternator...
IMO Gel batteries aren't worth the money. Vipers constantly came in with problems. I would just get a battery tender if you plan on letting it sit.

Also, probably not your alternator because it is after the car sits a few days only right?
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Old 04-22-2009, 03:38 PM   #11
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Re: Battery Drain Problems

I can jump it, go run it for a good while and it will charge it up. The problem with my GT was it drained it so far that the polarity reversed and I could not bring it back. This situation with the Cobra is the same, it is being drained fast. I ran it yesterday and it is dead today.
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Old 04-22-2009, 03:40 PM   #12
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Re: Battery Drain Problems

When this happened to Chrissy's lumina, it was a door lock issue. I pulled the fuse for her door locks and no more drain.
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Old 04-22-2009, 03:50 PM   #13
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Re: Battery Drain Problems

I have the battery on charge right now and am going to have to try to chase it down. I had a bad rear defrost switch one time that was stuck on even with the key off that kept draining a battery. It is probably something stupid like that, I did not know if someone knew of a problem that was consistent with the SN95 units.
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Old 04-22-2009, 05:41 PM   #14
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Arrow Re: Battery Drain Problems

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Originally Posted by SaleenFiend View Post
IMO Gel batteries aren't worth the money. Vipers constantly came in with problems. I would just get a battery tender if you plan on letting it sit.

Also, probably not your alternator because it is after the car sits a few days only right?
Well on other forums most people over there had Olympia batteries and no one had probs with it. It can still drain your battery but it takes way longer...

OP: I think you may have to take it to an expert, They dont charge that much just keep looking and don't let your car with the first guy you find... and let me know what was it.
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Old 04-23-2009, 06:44 AM   #15
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Re: Battery Drain Problems

the sn95's didnt have a discharging issue, and the alternator is definitely good because it wouldnt really run at all after it was jumped. it may be a switch that is stuck or shorted that would cause a slight drain. its basically going to be a process of elimination to seeing what is pulling the battery down. didnt u have issues with the rear defrost recently? could be on even though the light isnt lit up. one of the things u can do is get a voltmeter and check the current status of the battery while the car is off and then pull the fuse for the rear defrost and check the battery to see if the voltage moved around. if thats not it, it could be a number of things, but nothing i would think that is major. just gonna be a little pita, but a little patience and it will be found.
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Old 04-23-2009, 08:13 AM   #16
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Re: Battery Drain Problems

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the sn95's didnt have a discharging issue, and the alternator is definitely good because it wouldnt really run at all after it was jumped. it may be a switch that is stuck or shorted that would cause a slight drain. its basically going to be a process of elimination to seeing what is pulling the battery down. didnt u have issues with the rear defrost recently? could be on even though the light isnt lit up. one of the things u can do is get a voltmeter and check the current status of the battery while the car is off and then pull the fuse for the rear defrost and check the battery to see if the voltage moved around. if thats not it, it could be a number of things, but nothing i would think that is major. just gonna be a little pita, but a little patience and it will be found.
Thats exactly what you need to do, slowly but surely follow the process of elimination of electrical components. Start with fuses, once you find a fuse that changes the drain start diagnosing all the parts the fuse controls.
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Old 04-23-2009, 01:11 PM   #17
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Re: Battery Drain Problems

Got to autozone or wherever and get yourself a 5 dollar test lite and check all your fuses to see what's draining. Put one lead on the negative battery cable and other on the neg side of the battery and if it lites, you have battery drain. Now start disconnecting all sources of power (fuses and such) drain one at a time until the test light goes out.
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