car has trouble starting with in 12hours after that it wont start battery is good and nothing is on something?
battery tester July 4th, 2009is draining the battery and i have no idea what it is it took sears 40min to charge and test battery can battery have bad cell and tester cant find it ? can a short in starter be draining the battery ?once battery is charged or jump it starts so i rule out starter and maybe battery
alt is charging the system
a very old battery (life used-up) in their last few days life can still be recharged and get the car running. However, since their life has almost expired, their charge holding capacity is already shortened. The get easily drained even though they are not connected to the battery terminals. The best way to isolate the battery is to borrow a known good battery and install it in place of your battery. If the problem disappears then your old battery is the problem. If not, then go find an auto electrician who could do the troubleshooting for you.
July 5th, 2009 at 4:46 am
Check brake light switch on the brake pedal.
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July 5th, 2009 at 5:14 am
You have a drain on the system.
The only way to find the drain is to go backwards.
What I mean is eliminate things. Eventually you will have eliminated all but the problem.
I would suggest starting with anything on your vehicle that was not standard factory issue.
Stereo, speakers, auto start, etc. anything that was added after it was sold new.
Wiring problems are individualistic and will require some sleuthing skills, eliminate suspects until you find the culprit.
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July 5th, 2009 at 6:01 am
disconnect battery let it sit 12 hours then reconnect battery if car starts you have a draw somewhere on the car if it does not start try another battery if it is a draw take it too a shop almost anything could cause a draw and you need special equipment to find it good luck
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July 5th, 2009 at 6:13 am
had a supra did the same thing take your car to an auto parts store that offer alternator testing have them to test yours
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July 5th, 2009 at 6:31 am
could be the alternator..
buy a voltometer, like 15 bucks at sears. put it on volts, and place the black part with the neg, and red with positive, with your engine running, the read out should be between 12-16, 14 being perfect. shut the engine off, and do the same. if the readout drops below12, your alternator needs to be replaced.
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July 5th, 2009 at 6:48 am
Take off the neg. bat. cable, and put a lite tester between it and the bat. If the lite goes on, you have a short. Remove the fuses one at a time. When the lite goes out, you found the short.
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July 5th, 2009 at 7:13 am
a very old battery (life used-up) in their last few days life can still be recharged and get the car running. However, since their life has almost expired, their charge holding capacity is already shortened. The get easily drained even though they are not connected to the battery terminals. The best way to isolate the battery is to borrow a known good battery and install it in place of your battery. If the problem disappears then your old battery is the problem. If not, then go find an auto electrician who could do the troubleshooting for you.
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July 5th, 2009 at 7:18 am
All modern cars put a drain on the battery- clocks, radio presets, security systems….etc. But these drains are small drains a battery can handle between start-ups. You have a major drian if it’s killing your battery. .
My guess, and it happened to me, is your starter isn’t fully releasing and it’s putting a drain on your good battery.
Two so called auto electrical shops couldn’t figure this out, but my starter was the only thing not replaced. I put a new stater in and no more battery drain problems.
Just my story-may not be yours, but I’d bet on it.
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from experience