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My kia battery goes dead about every two weeks, i had a off car battery test that said it was good. I then had an on car alternator test that said it was good. Still the same problem. I just replaced the battery and it went dead the same day, would not start off a jump, but after a while it started without the jump!
2001 sephia changed belts rebuilt altenator and new battery and car still stalls out after an hour or 2 of driving. give it a boost starts...turn it off and its dead again....is it a voltage regulator..need help
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you have a problem with the electrics it could be a bad round or the live terminal lead to the battery, it could be shorting to ground this would damage the alternator and the battery. you would need to test the wires from the alternator B+ to the live on the battery and the earth from the alternator grounding bolts to the shell then check the live to negative with the battery off. a short in the circuit will just keep damaging the system.
the way an alternator works is it has to have what is called a voltage sensing wire, which tells the alternator what level of charge your battery has and how much the alternator needs to put out. If your battery cables are corroded or damaged you can change the battery and alternator every week and the problem will persist. I would start buy checking cables and sensing wire (wire from alternator to battery) and be sure they are free of coorosion and visible damage. if all appears good then do a voltage drop test on battery terminals and cables. also voltage drop test on voltage sensing wire (wire form alternator to battery). this series of test should give you an answer. any further questions feel free to ask.
Check to see that the trunk light and glove compartment light actually turn OFF when the trunk and glove box doors are closed. Also, if one of the diodes on the alternator has failed, it may still test "good." With the car sitting, ignition off, fully-charged battery, check to see if the back of the alternator is HOT. If it is HOT, replace the alternator.
check for bad cell, need a battery tester so it can put load on battery it might read 12 volts till u test.read voltage from alternator batt connection should be more than 12 volts. if its 13 or more be sure wire goes back to battery is charged and connected,
There is probably a weak diode in the alternator; this will cause the battery to drain slowly and will often not turn on the indicator on the dashboard.
If you want to get your hands dirty, remove the negative battery cable first (always!)
Remove the heavy lead from the alternator terminal that goes to the positive terminal of the battery.
Reconnect the negative battery terminal.
If the car starts mornings, a bad alternator is pretty much confirmed but you can't drive real far with no alternator to charge the battery.
Any chain auto parts store will test your alternator free but I don't know if that is in or out of the car.
BTW, you can buy a digital meter for under $20 many places today and most will have a 10 ampere range that will allow you to check for a current drain of the kind you now have which is probably under the 10 amps.
One final item; recently the courtesy light switch on the passenger side rear door of my wife's Jeep recently decided to not quite reach anymore and the battery was drained twice before I noticed that 'door ajar' light was telling us that in advance. Even an amp or two will drag a battery down given time.
You May Just Want To Start By Removing The Battery Terminals And Cleaning Them With A Wire Brush And Baking Soda. It Will Reset Your Dash Lights As Well. A Small Short Can Drain A Battery In A Night.
it may maybe that the alternator doesnt give out the specific amount of electricity to properly charge your battery. you may have to run some tests on the alternator itself to see if it is giving out the proper current to charge.
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