1998 Mustang GT Battery dead - Mustang Evolution

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Old 07-18-2014, 05:21 PM   #1
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1998 Mustang GT Battery dead

I know this is a common problem and there are multiple threads over this.

Here is what I am thinking, and would like yall's expertise.

-Car battery dies after a few days/week of sitting.

-Replaced battery recently and keep undoing the negative battery cable.

-Alternator could not be the problem, right? Because it does not charge the battery while car is sitting?

-What is my next move?

Thanks.
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Old 07-18-2014, 06:49 PM   #2
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Take the battery to autozone and get them to test it.

It's most likely one of two things

Either you have somethin really small that is barely draining the battery, or you have a dying battery that is slowly losing it's charge. I'd prolly say a battery that is on it's way out.

Is it still the stock battery? My gf's stock one just died.. 11 years later lol. How old is your battery


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Old 07-18-2014, 06:57 PM   #3
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It was doing this with the old battery. Just replaced the battery a month ago. I do not drive this car often. It has 58K on it. But when I put the cable on the battery there is a bit of a spark. There shouldnt be a spark right?
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Old 07-18-2014, 07:05 PM   #4
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Quote:
Originally Posted by Harmon View Post
It was doing this with the old battery. Just replaced the battery a month ago. I do not drive this car often. It has 58K on it. But when I put the cable on the battery there is a bit of a spark. There shouldnt be a spark right?

Yes there should be. It shows that there is current flowing through pos and neg's. Battery can randomly go bad. I'd try autozone first. If it's good then you have to address a small amount of power being sucked up slowly.


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Old 07-18-2014, 07:10 PM   #5
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Sounds like you have something draining the battery
Do you have an aftermarket alarm or sound system?
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Old 07-18-2014, 07:39 PM   #6
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It has the same alarm that came with the car. Same radio as well. Have done no mods.

We took the Lo'Jack theft detection device out thinking it could be causing the problem. No fix.
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Old 07-18-2014, 11:20 PM   #7
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I have this same issue but only in the cold weather when It's stored here in Michigan. I have yet to figure it out, I quit due to the car being fine in the warmer months. I assume It's some sort of parasitic power drain. I'm sure it still does it in the summer but It's being driven more and doesn't have the cold to deal with as well. I did many searches and this seems to be a issue with Ford vehicles across the board from the 90s. Anyway hope you figure yours out.

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Old 07-19-2014, 08:15 AM   #8
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The first thing is to determine if the battery and charging system are healthy. Autozone is good for this one. It's not 100 percent check as you could have an intermittent problem in the battery or alternator that is not showing up during the test. But it is a pretty decent check out and it's free.

If you have a VOM you can do basic checks yourself.

Should be at least 12V across battery with car turned off and 13.5 - 14.0 volts when car is running. Turn everything on when you test it running. Lights, radio, defogger, A/C etc.
Not as good as using a load tester but a decent way to do a basic check.

Once that's established, like Steve96 said, you are looking at a parasitic drain.
You need a VOM set to measure current and hooked up in series with the battery.

Compare the measurement to the spec for this car. You will have to Google that one.

Then start pulling fuses one at a time (put them back) until the current drops.
When you find the fuse that causes the current to drop a significant amount, you now know what circuits are involved by looking in either the FSM or even your owner's manual. Start looking in those areas.

The usual suspects are:
Power seat switch(s) sticking.
Radio.
Trunk/Glove box lights
GEM module, at least in 99-04 cars.

This is a common problem and some people just put a battery disconnect switch in and use it when the car is going to sit for a few days or a week or so.
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Old 07-19-2014, 10:22 AM   #9
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Hey thanks for the insight.

The Driver seat switch will power the seat forwards and backwards, but will not move up and down.

I wonder if that could be related?
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Old 07-20-2014, 08:16 PM   #10
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I can't remember but did ford have recall on the 04 or was it the 05 for fuse block current draw.


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Old 07-20-2014, 11:25 PM   #11
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I think mine is radio related.

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