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November 21, 2018, 10:05:09 AM
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Author Topic: Weak Battery causing issues  (Read 1247 times)

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Offline Dreaded1

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Weak Battery causing issues
« on: July 07, 2014, 08:38:40 AM »
I know my battery is shit because if I listen to the radio for 10 minutes without the car running the battery will die. I threw it on a charger last week overnight, at 10pm it started at 13%, at 7am I disconnected it with 15%. Now I am wondering if this would cause other issues. The one that I have notice recently is the low gas light comes on at random times. This morning I started the car and the light was on, but the gas gauge was on the high side of 1/4 tank. For a while I have noticed that the light was coming on way before it should, but at 1/4 that seems crazy. Maybe the low level indicator is going bad? Anyone ever have the light come on this early?
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Offline deadlydave

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Re: Weak Battery causing issues
« Reply #1 on: July 07, 2014, 08:42:15 AM »
That battery sounds pretty bad.  If it can't put out consistent voltage, you can definitely get some electronic wonky-ness.  You can also overwork, and fry, your alternator.

Offline stylesrex

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Re: Weak Battery causing issues
« Reply #2 on: July 07, 2014, 09:14:22 AM »
Short answer: yes, it is possible that a weak battery can cause intermittent "issues".  I say it like that bc whatever sensor is throwing an indicator light, is receiving voltage/current out of spec.  It may be a sensor on its way out however, it is also likely that it is from low signal/current.

Longer response:

Regarding the fuel level.  Most of fuel level transducers are mechanical float type. Think of toilet "fill bowl" shut off. toilet fills bouy floats until water reaching require height, water stops.  You could have a failing float/level sensor, but there are few mechaincal pieces that could be jammed, bound, stuck causing low level indicator.  Take apart and test actuation.  Or find a multimeter and spec for level operation, test outputs as you move the float.

Offline Outback_Jon

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Re: Weak Battery causing issues
« Reply #3 on: July 07, 2014, 01:31:23 PM »
That battery sounds pretty bad.  If it can't put out consistent voltage, you can definitely get some electronic wonky-ness.  You can also overwork, and fry, your alternator.
+1.  Got a multimeter?  What's the voltage of the battery without car running?
Without knowing anything, I'd suspect a bad cell in the battery.  I'll bet you're below 12V with the battery just sitting.  I'd suspect the battery is causing your fuel light, too.
Advance Auto, and probably Autozone, can test a battery for you.  Be certain to plan a bit of time there, since they'll need to run their charger on it first.  Although I've had Advance Auto declare a battery to be fine when it really wasn't.
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Offline wheelbuilder_25

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Re: Weak Battery causing issues
« Reply #4 on: July 07, 2014, 02:48:30 PM »
A low voltage would also have to work 'harder' against a fuel level sensor that may have somewhat higher resistance (ie:older cars).  Meter the battery, or check the specific gravity of each cell.  You should easily have over 12 volts steady on a good battery (engine off).  A bad battery self discharges fairly quickly, lowering both values (gravity and voltage).  Unless you get that one fun battery in 1000 that goes dead short.
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