Normal Battery Drain - Jeep Wrangler Forum

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Old 08-07-2012, 12:25 PM   #1
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Normal Battery Drain

Hi all

What is the normal rate of battery drain on a jeep?
After driving my voltage is at 12.7 , one week later at 12.4

is that normal?


Thanks

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Old 08-07-2012, 01:20 PM   #2
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Anyone?

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Old 08-07-2012, 02:09 PM   #3
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do you have any electrical issues?

heres what my battery looks like

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Old 08-07-2012, 02:11 PM   #4
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Not really ...just had a compustar alarm starter installed and want to make sure it is not draining the battery at a higher rate than normal

thanks
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Old 08-07-2012, 02:32 PM   #5
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When you shut the engine off, the battery will go to a resting voltage. If it starts unaided two or three weeks later, you have nothing to worry about.

You can measure parasitic draw with an automotive voltmeter and a shunt (like a used Snap-On MT500)

Here is one:
Snap on tools Precision Diagnostics Meter MT500 | eBay

You hook the resistor(shunt) in series with the battery and measure the voltage across it. (easy to do). If there is a drain, you start disconnecting accessories (or pull fuses) to find the culprit. If your battery dies down in a few days, it'll tell you if it's on a circuit - then you look for a vanity mirror light, door lock solenoid, external amp, car alarm, etc.
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Old 08-07-2012, 02:34 PM   #6
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thank you
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Old 08-07-2012, 02:36 PM   #7
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The voltages you mention are fine.

If you really want to measure the drain you need to disconnect your negative battery cable and install an ammeter between it and the battery. The current draw should be minimal. Anything over .25 amp is questionable and over .5 amp is not good. Most vehicles are under .1 amp.

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