I need your help...I own a 2005 GT going on two years the end of this month. Just last week it started up with somthing draining my car's battery power? This has never happend before first time? This car is not my daily driver so most of the time it will sit in the garage for three to four days before I decide to take it for a spin...it has always started right up before unitl last week. I go to use the key less entry to unlock the door and it doesn't work no battery power to even unlock the door. How many of you have run into this problem with your 2005 mustangs? What have you discovered the problem is?
Thank You,
Carolyn
Here's several posts that will explain in complete detail what the problem and solution is that you may find helpful..I've taken my 05 to 3 different dealerships, for the very same reason and didn't finally get a straight answer, until speaking with a Ford field service engineer..And this may not make any sense, but it appears that this is how Ford designed these cars, and the explanation I got was, each computer has a timer that is running continulessly, in addition each sensor or module also stores computer memory.. for ie there's one for the drop down window module, another for the motion sensor on the alarm system, another for the radio, power door locks, power windows and so on..and if the vehicle sits for more than 10 days and the battery is not fully charged and also if the computer reads less than 9volts, it will automatically drain the remaining voltage as some sort of fail safe protection, that has to do with preserving computer memory..I was also informed that it's even worse, if you start the vehicle and only let sit at idle for 15-20 min. because he claims that sitting at idle, does not rev the rpm's enough to fully keep the battery charged..Therefore, their are only 2 options..either run and drive the vehicle at least once every 5-7 days or install a tender or trickle charger if the vehicle is going to sit more than a week...As I said before, I know this doesn't make much sense and I still don't quite understand it all, but that's just how these cars are now designed..Anyway, hope this helps out in someway...Quote:
Originally Posted by 310stanger
as a ford tech i have this to say. the ford motocraft batteries really seem to be crap. we replace them constantly on stock units. meaning cars on our lot that may sit for awhile. also. if you dont run your car for a long time yes there actually is a draw. the computer uses some electricity to run your kam. KeepAliveMemory. bring it to your ford dealer and see if they can warranty you a battery.....
Quote:
Originally Posted by red05bullitgt
As for the Motorcraft Batteries are concerned ?? I couldn't agree more.. In less than 2 years of owning my 05 GT I'm now on my third battery, The first one lasted 2 months and the dealership replaced it due to it having a bad cell and then got 6 months out of the second before it went dead, took it another dealer for a second opinion who claimed that battery more than likely sat on the shelf too long and wasn't fully charged, so they replaced that one as well and was then advised by their feild service engineer to invest in a tender charger and ever since then, I haven't had any dead battery problems..However, I still think that it's rediculous that a brand new car can't sit for more than 10-14 days without it's battery going dead but at least I'll give the dealerships credit for this ?? they did replace both batteries under warranty...Anyway, being that your a Ford tech. perhaps you can answer this for me..Does the electricity that is required to run the keep alive memory, cause enough of a draw to drain these batteries, if they sit for 2 weeks ?? or does it take longer than that ?? The reason why I ask, is because this was also what the feild service engineer explained and this is the explanation that seems to make any logical sense..
evidently it does, i havent ever tested the draw from the computer across the power to test but if i remember i will and report back. one thing i can say more then anything is that i think a lot of these batteries although they may start the vehicle dont actually have a full charge which is what i feel to be a big reason on why they go dead. your battery needs to have a full charge to avoid it going dead when its left to sit. personally i highly recommend you guys using a battery tender if at all possible. or even pulling ur batteries and chargin them up then storing them. an easier way may be to jus disconnect the battery. when i perform work on my 5.0 and i know the car is gonna sit i jus disconnect the battery and dont seem to have a problem. granted my car is quite a bit different. but dont feel bad guys, all fords at my work across the board i have replaced batteris in before they even leave the dealer. now one could say that ford engineers the vehicles **** up and be right, another could say that motorcraft batteries suck and you wont be getting any disagreement from me on it.
