Battery dead -- cause of drain?
#1
Instructor
Thread Starter
Battery dead -- cause of drain?
After driving my '04 Thursday extensively, now on Saturday, it won't start. Battery completely dead. Had to connect jumper battery to open hood, and then jumper cable to discharged battery. Radio, lights, etc. functioned, engine would make one (feeble) attempt and turning over, then clicking noise. Turned key back to off position, and I hear this soft, two part "thunking" noise about every 15-20 seconds. I repeated this cycle three times. The thunking continued each time until I gave up and disconnected the jumper cables. The battery is now back to totally discharged. No more thunking noise.
Any ideas what I should do next; or what the thunking (or clicking) noise was? Thanks in advance. Hurts to have a dead sleigh on Christmas eve. FYI, it is a one year old factory battery.
Barring any suggestions, looks like the car is being towed to the dealer.
Any ideas what I should do next; or what the thunking (or clicking) noise was? Thanks in advance. Hurts to have a dead sleigh on Christmas eve. FYI, it is a one year old factory battery.
Barring any suggestions, looks like the car is being towed to the dealer.
#3
Drifting
If you are positive your battery (I would take it out and have it tested - even new batteries can have a cell go bad) is good then you need to put an amp meter inline with the battery. Then remove fuses one at a time until you find the fuse circuit that is drawing all of the power. Normally a 996 draws about 40-60ma (as I recall).
Once you find the circuit where the drain is then it should be fairly easy to trace down the component.
Once you find the circuit where the drain is then it should be fairly easy to trace down the component.
#5
Instructor
Thread Starter
Just returned from the Zone...
...AutoZone says battery is fine. Problem is likely related to that thumping noise I referred to in original post. My wife said she heard it in the garage last night but thought it was a tree limb blowing against the garage. No clue what would be making a thumping sound every 15-20 seconds....it almost sounded mechanical.
#6
Race Car
After driving my '04 Thursday extensively, now on Saturday, it won't start. Battery completely dead. Had to connect jumper battery to open hood, and then jumper cable to discharged battery. Radio, lights, etc. functioned, engine would make one (feeble) attempt and turning over, then clicking noise. Turned key back to off position, and I hear this soft, two part "thunking" noise about every 15-20 seconds. I repeated this cycle three times. The thunking continued each time until I gave up and disconnected the jumper cables. The battery is now back to totally discharged. No more thunking noise.
Any ideas what I should do next; or what the thunking (or clicking) noise was? Thanks in advance. Hurts to have a dead sleigh on Christmas eve. FYI, it is a one year old factory battery.
Barring any suggestions, looks like the car is being towed to the dealer.
Any ideas what I should do next; or what the thunking (or clicking) noise was? Thanks in advance. Hurts to have a dead sleigh on Christmas eve. FYI, it is a one year old factory battery.
Barring any suggestions, looks like the car is being towed to the dealer.
BTW, did you find out what the thumping in your garage was? Poltergeist perhaps? I can't figure out from your post if your battery is still dead or has been resurrected!
Last edited by Phil G.; 12-22-2007 at 05:58 PM.
#7
Instructor
Thread Starter
Still Comatose...
...awaiting a flat bed for a trip to the dealer Monday morning. No ghosts in the garage, just a 911 that refuses to start. No amp meter, so they'll have to figure out what or where the drain is. Thanks, everybody.
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#9
Years ago on my 993, just as I was about to leave on a 2 week trip, one of the fans kicked on by itself even though the car was turned off. Although the fan running after turn off was not that unusual, it never turned off. It just going and going. I had to disconnect the batttery to keep it from draining while I was gone.
It sounds like you might have some relay that is staying open and not turning off which drains the battery. But then I can't think of anything on a 996 that might make a thumping sound.
It sounds like you might have some relay that is staying open and not turning off which drains the battery. But then I can't think of anything on a 996 that might make a thumping sound.
#10
Instructor
Thread Starter
Fixed, thanks to AAA.
Kid had adjusted passenger seat, and the power seat control had become lodged in the "furthest back" position.
Seat control repeatedly attempted to move seat;
caused thunking noise, and drained battery.
After jump start, and releasing seat control from stuck position, I'm good to go. Thanks!
Kid had adjusted passenger seat, and the power seat control had become lodged in the "furthest back" position.
Seat control repeatedly attempted to move seat;
caused thunking noise, and drained battery.
After jump start, and releasing seat control from stuck position, I'm good to go. Thanks!
#11
Race Car
Fixed, thanks to AAA.
Kid had adjusted passenger seat, and the power seat control had become lodged in the "furthest back" position.
Seat control repeatedly attempted to move seat;
caused thunking noise, and drained battery.
After jump start, and releasing seat control from stuck position, I'm good to go. Thanks!
Kid had adjusted passenger seat, and the power seat control had become lodged in the "furthest back" position.
Seat control repeatedly attempted to move seat;
caused thunking noise, and drained battery.
After jump start, and releasing seat control from stuck position, I'm good to go. Thanks!