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2005-2010 Mustang GT Tech Forum

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Unread 03-17-2009   #1 (permalink)
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Default 2005 Mustang GT Battery Drain Problem...

My 2005 Gt has a 1 amp drain all the time thru the SMJ low current board. The fuse is 1-59 and 1-67. Has anyone out there had this problem? All else appears to work normal. What is the normal current drain in the key off state ?? Any help will be most appriciated..
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Unread 03-17-2009   #2 (permalink)
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Gosh, I dont know about all that..but I've had multiple scenarios of dead battery since brand new...ended up getting a battery tender.
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Unread 03-17-2009   #3 (permalink)
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Default Battery Drain Problem

Pulling all fuses from the fuse panel of the smart junction box does not interrupt the current flow. 1.08amp thru fuse 1-59 and .083 Amp thru F1-67 with nothing on but the clock in the radio and the unarmed alarm system.
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Unread 03-18-2009   #4 (permalink)
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could it be the stereo?
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Unread 03-18-2009   #5 (permalink)
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Any Suggestions?

I do not think so as I have all the fuses pulled. I'm going to see if I can find a schematic of the low current board. It may be something on the board itself shorted out, although all functions seem to be working at this time.
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Unread 03-18-2009   #6 (permalink)
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I believe the active alarm draws current even when the system is not armed.
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Unread 03-18-2009   #7 (permalink)
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Friends have Corvettes that sit in garage a lot and they run down also.Most use tenders also.
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Unread 03-18-2009   #8 (permalink)
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I had the exact same problem and called ford. They said its the amp from the shaker radio. After i pulled fuse #16 i think it was, (Front shaker amp) i haven't experienced any battery drain. However, that electrical problem lead to other problems, and now my car wont even start...
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Unread 03-18-2009   #9 (permalink)
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Quote:
Originally Posted by stlwagon View Post
I believe the active alarm draws current even when the system is not armed.
That is true, even unarmed, the security light blinks on the dash. I believe the circuit that reads the chip in your key is always activated.
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Unread 03-19-2009   #10 (permalink)
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Quote:
Originally Posted by thsisinsanity View Post
I had the exact same problem and called ford. They said its the amp from the shaker radio. After i pulled fuse #16 i think it was, (Front shaker amp) i haven't experienced any battery drain. However, that electrical problem lead to other problems, and now my car wont even start...
There has been a problem with the amps continuing to draw power after the key is off. If you turn off the stereo first, that may resolve it.
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Unread 03-19-2009   #11 (permalink)
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Default Battery Drain Problem

Thanks for all the ideas & info. I think I may have found the problem. While having the rear seat back folded down, I noticed the trunk light was on well after the overhead lights had went out. I gave it about ten minutes and it finally went out. I checked my current meter and it was near zero, so I think that was the problem. Don't know why it was on with the fuses pulled though. Must be fed directly off of the low current board of the smart junction box , which is fused. I'll have to dig into that to see.. I will continue to monitor for awhile. Again, thanks....
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Unread 03-20-2009   #12 (permalink)
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I let my car sit thru the week. it used to be dead every weekend. I started turning off the radio before turning off the engine. I have not had a battery problem at all since that time. I read somewhere that if you turn off engine while radio is on, it keeps the amps running.
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Unread 06-18-2010   #13 (permalink)
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I have this same problem with the shaker 500 draining the battery and in my case, it doesn't matter if I turn it off before I turn off the car. The battery is draining because the 6-disc changer spins all night (or day) trying to load cd's that aren't even there. As much as I hate to do it, I guess i'll have to go find a cheap alpine or kenwood head unit that is offering free install and put the shaker on craigslist unless someone here has heard of some kind of a fix for this problem???
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Unread 06-19-2010   #14 (permalink)
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Mine has always had a battery drain issue. I wired in Tender leads and it takes all of 2 seconds to plug it in when I park it. Small price to pay.
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Unread 06-20-2010   #15 (permalink)
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I cant believe that a drain on the Elec system that discharges a battery in a few days or overnight is considered normal.. I park mine for the winter and it sits for a month at a time before I usually get a chance to run it. No problems... My car is going on 6 years old and still on the original battery. Come to think of it, its time to change that sucker.
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