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2005-2010 Mustang GT Tech Forum

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Unread 10-12-2013   #1 (permalink)
socdmd143 is offline Rookie


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Any Suggestions? Radio being the cause of battery drain

After doing my own research I realized that the radio and alarm drain the battery when the car is off, obviously that alarm would stay on but to drain a battery in 24hrs, its a ford manufacture problem which they will never admit to and fix, so only choice with that is to bother the hell out of them for a recall. but the radio's AMP(shaker 500/1000 system) is what's the other problem, the amp stays on and if anyone can read a wiring diagram better then me you can see where and why, also i'm guessing the (audio imput jack) is the amp. I may be wrong that might also be the center console plug in jack. So the short of it is, if you have a '05-09 run a shaker system you most likely have an issue with starting you mustang, even if you drove it the night before, you may not be able to start it in the morning. but don't run out and buy a starter or alternator right away or even a more expensive battery. And if you want to be someone who hooks up their stang to a trickle charger or a batter tender every night and unhook it every time you want to drive then you are a better owner then me.
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Unread 10-12-2013   #2 (permalink)
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I have an 06 with shaker and alarm and my battery doesnt drain.

you have another problem that is causing the drain. there is alot of shaker cars on the road that dont drain overnight. I dont think ive ever heard of it at all.

in fact most of todays cars have accessories that remain powered by the battery full time. its a really low draw and shouldnt be causing drain. If you are experiencing overnight drain its most likely a bad battery, or a poor alternator that isnt charging the battery fully. i know you said you had it tested but thats what i think it is.
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Unread 10-12-2013   #3 (permalink)
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So what did you do?
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Unread 10-12-2013   #4 (permalink)
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the MAIN THING TO DO IS TO TURN OFF THE RADIO BEFORE TURNING OFF THE KEY.
Yes its a but leaving the radio on when you turn the key off seems to leave the amplifiers on, and that's what drains the battery.
Also, just because it's a new battery doesn't mean it can hold a charge for long. I recently replaced the battery and it died within a couple days, then randomly would not hold a charge even overnight, and that's with making sure the radio is off before turning off the key. A new battery solved that.
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Unread 10-12-2013   #5 (permalink)
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I don't have a stock stereo but still have a stock amp. I've never had any trouble with starting and always left my stereo on when I shut down the car, had no trouble with the stock Shaker 500 for a couple years and still no trouble with an aftermarket unit for the past 6 months.

Looking at the wiring diagram there's nothing that stands out as problematic. Granted I wouldn't expect to find anything there... the 'problem' would likely be internal to the radio or amp so the diagram provided is pretty much irrelevant. I'd need a schematic of the Shaker H/U and/or amp internals to even start looking for a possibly problematic circuit.

All I see in the provided diagram is a run of the mill basic car stereo wiring setup... Shielded aux input, antenna(s), constant +12V, switched +12V, and ground signals as inputs, speakers as outputs, and (in the Shaker's case) a couple data lines to control the function that adjusts volume based on vehicle/engine speed.

I'm not saying there *isn't* a problem with some cars (or some stereos/amps), but this is the first I've ever heard of it and never had any trouble with stock or aftermarket stereos. Any stereo will cause a SMALL drain on a battery even when the vehicle is off... that's almost necessary in order to save your presets and settings... but this drain is pretty much negligable.

If you're having trouble I'd suspect it's something other than your stereo unless you've done the tests to prove it's the stereo.. If you can, pull the head unit and amp from the vehicle and use a multimeter to measure the current that your head unit or amp are drawing while the vehicle is off. That's the only way to know for sure exactly how much power the component is using in an 'off' state.
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Unread 10-13-2013   #6 (permalink)
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Quote:
Originally Posted by themangeraaad View Post
I don't have a stock stereo but still have a stock amp. I've never had any trouble with starting and always left my stereo on when I shut down the car, had no trouble with the stock Shaker 500 for a couple years and still no trouble with an aftermarket unit for the past 6 months.

Looking at the wiring diagram there's nothing that stands out as problematic. Granted I wouldn't expect to find anything there... the 'problem' would likely be internal to the radio or amp so the diagram provided is pretty much irrelevant. I'd need a schematic of the Shaker H/U and/or amp internals to even start looking for a possibly problematic circuit.

All I see in the provided diagram is a run of the mill basic car stereo wiring setup... Shielded aux input, antenna(s), constant +12V, switched +12V, and ground signals as inputs, speakers as outputs, and (in the Shaker's case) a couple data lines to control the function that adjusts volume based on vehicle/engine speed.

I'm not saying there *isn't* a problem with some cars (or some stereos/amps), but this is the first I've ever heard of it and never had any trouble with stock or aftermarket stereos. Any stereo will cause a SMALL drain on a battery even when the vehicle is off... that's almost necessary in order to save your presets and settings... but this drain is pretty much negligable.

If you're having trouble I'd suspect it's something other than your stereo unless you've done the tests to prove it's the stereo.. If you can, pull the head unit and amp from the vehicle and use a multimeter to measure the current that your head unit or amp are drawing while the vehicle is off. That's the only way to know for sure exactly how much power the component is using in an 'off' state.
you went into much more detail than i did but i fully agree with your opinion.
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Unread 10-13-2013   #7 (permalink)
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Default radio being the cause of battery drain.

I change my battery every 2 years.I have a 2 way alarm system on my 05 GT. This should help you.

Last edited by night rider; 08-15-2014 at 12:20 PM.
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Unread 10-13-2013   #8 (permalink)
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I have the same battery since new on my 2006...I use a trickle charger when not driving the stang for at least two-three days...BTW, its not my daily driver.
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Unread 10-14-2013   #9 (permalink)
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There have been problems reported in past with the Shaker sound system running down the battery, and it appears to be related to the Keep Alive Memory (KAM) in the radio. I had my Shaker 500 replaced once under warranty for this issue, but the problem then started to occur in the 2nd system also. The simplest fix is to just turn the radio off before turning off the ignition, which seems to make it shut down properly.

The first symptom was a run down battery, and the radio had lost its time. However, I also happened to get in the car once about an hour after parking it and found what was running the battery down. The car and radio were off but the CD changer was shuffling CD continuously. When I turned the radio back on it had a CD error code displayed and would not eject the CDs. After several times of turning it on and off and hitting the eject button it finally went back to normal and ejected the CDs.

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Unread 10-14-2013   #10 (permalink)
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Quote:
Originally Posted by TexasBlownV8 View Post
the MAIN THING TO DO IS TO TURN OFF THE RADIO BEFORE TURNING OFF THE KEY.
Had the same results.
2 times I've didn't turn the radio off when parking the car, 2 times a flat battery. I'll leave my car parked for a week at a time so I'm not sure it'll drain overnight.
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