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Old 05-23-2015, 03:04 PM
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Smile Hello from California - 2005 Cherokee kills batteries

Just to say hi and been fighting all usual problems related with battery drain.

UGH! 55 yrs as an Electronics Tech but running in circles.....

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Old 05-23-2015, 03:46 PM
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Re: Hello from California - 2005 Cherokee kills batteries

Welcome to the garage.
What did you do sofar to solve the battery drain problem?
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Old 05-23-2015, 05:22 PM
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Re: Hello from California - 2005 Cherokee kills batteries

Hi- As a matter of fact my home brew low voltage alarm just triggered in the house 15 minutes ago to advise me the batt voltage is below 11.79 volt dc. I got tired of jumpering if jeep sits for 2 days. so I built an alarm. Engine is currently running as I write HI! I've got all the electronics to fix anything, but my arthertis in my shoulders kills me trying to get under the dash etc. Here is a brief listing of other peoples ideas and my own. Fresh new battery, checked ALL 6 diodes for leakage, looked under seats for rubbing wire looms possibly shorting when seats are moved. (Don't have seat warmers so didn't do that.) Measured current from battery. About .050 Ma once door closed and inside lights dim off. About 1.5 amps with door open and inside lights on. checked starter wiring loom. checked around inside fuse block USA steering on left side. I am trying to catch the current when jeep is trying to kill battery. If I pull the JB fuse the battery voltage remains constant. With the JB fuse out and I start the jeep the headlights come on until I insert the fuse or shut the engine off. This is a consistant INTERMITTANT -- In otherwords, if jeep sits for two days =dead battery (4.5 volts) If wife goes shopping every day car is good to go next day. I suspect current drain is 2-4 amps in order to deplete batt that low over 24 hrs. BUT not a hard short! Recall a dead short will either burn up the wiring or blow a fuse somewhere. Thats where its at at this moment. I have years of communications radio installs and repair plus engineering and honestly this problem would be easier if a fuse would blow. Oh well... you asked..
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Old 05-23-2015, 11:25 PM
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Re: Hello from California - 2005 Cherokee kills batteries

The current draw with doors closed and lights off is 50mA, right? (you wrote .050mA, but probably ment .050 A). That seems to be a normal figure. But indeed to drain the battery within 24 hrs, a much larger current is necessary. Did you check the current draw over a prolonged time, to see if it doesnīt increase over time? Looks almost if a module wakes up. There are some stories known of sunroof module which drains the battery.
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Old 05-23-2015, 11:50 PM
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Re: Hello from California - 2005 Cherokee kills batteries

Hi Frank, you are correct I did mean to say 50 ma. The list was just way beyond my ability to type... Ha. Well I have the alarm running now that monitors the batt voltage and as soon as it drops to 11.75 volts a buzzer sounds in the house. Today was the first time in two weeks that the alarm tripped. The reason is because we are always driving shopping, or getting our granddaughter from school or band. Anyway for anyone interested, I have a zener diode and relay with a potentiometer for setting the voltage. Simple solution would be for me to just run the jeep if the alarm activates but my plan is to catch the line that is drawing the current. Its tricky because as soon as I lift the battery and connect the amp meter in series everything goes back to normal. My solution is to lift the batt lead and set my simson vom for 10 Amp scale and leave it hooked up all night and when the voltage alarm goes off hot footed out and see how much current is being drawn. Remember--- once you disrupt the battery line, everything will be okay for a short spell. To kill a heavy duty new lead acid battery I expect to see anywhere from 4-8 amps. Much more than that the battery will draw down much quicker. Thats it for now.
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