How can I check if I have a power drain - Taurus Car Club of America : Ford Taurus Forum
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post #1 of 16 (permalink) Old 07-18-2019, 11:04 PM Thread Starter
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How can I check if I have a power drain

In the morning my car start's are weaker as in they take a little longer, it always eventually starts (so far). I have a multi meter and next to no knowledge about electricity. How can I be sure I have a power drain. Right now I don't care about finding the source, just want to confirm that I have one.
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post #2 of 16 (permalink) Old 07-19-2019, 05:07 AM
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Check the resting voltage at the battery when you get home in the evening and record it, check again in the morning and compare the values. A healthy charged battery should have a resting voltage in the 12.35 to 12.6 range. Keep in mind failing to maintain a charge doesn't necessarily mean a drain, it's also the first sign of a failing battery.

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post #3 of 16 (permalink) Old 07-19-2019, 10:58 AM Thread Starter
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Originally Posted by jag1959 View Post
Keep in mind failing to maintain a charge doesn't necessarily mean a drain, it's also the first sign of a failing battery.

Thank you for the response. I have a ~2 year old battery from autozone. I heard that batteries last around 4 yrs
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post #4 of 16 (permalink) Old 07-19-2019, 02:46 PM
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Originally Posted by ofor_towrust View Post
Thank you for the response. I have a ~2 year old battery from autozone. I heard that batteries last around 4 yrs
If a battery is not faulty or damaged, they should be good for 3 years if you are only interested in "will it crank".


If you are also interested in how long it will last if the Alt fails away from home. The attached chart shows same battery new and at 3 years of normal use. Also a new identical battery and it starts out exactly the same but was not discharged as that can shorten the life. Just shows the repeatability of the test.


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post #5 of 16 (permalink) Old 07-19-2019, 06:45 PM Thread Starter
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Need wiring diagram for a circuit

Hey, I recently diagnosed to have a parasitic power draw from the circuit controlled by fuse #33 under the steering wheel. How can I further identify which part circuit is causing the problem?

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post #6 of 16 (permalink) Old 07-20-2019, 08:16 AM
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Have you tripped the door latches to fool the electronics to think the doors are closed? Several modules including the GEM/SJB do not go to sleep for 30 minutes after the key is turned off or the GEM/SJB detects some activity like doors being open or closed. You must measure draw after all the modules go to sleep to get an accurate amp draw reading..

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post #7 of 16 (permalink) Old 07-20-2019, 11:53 AM
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OP: Your threads have been merged, it honestly helps us help you when the troubleshoot is confined to one thread.

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post #8 of 16 (permalink) Old 07-22-2019, 01:41 AM Thread Starter
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new reading

So...I tested it again, this waiting longer after shutting off the car and locking the doors. Got a new reading 0.39mA. So I think that means I am good.


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post #9 of 16 (permalink) Old 07-22-2019, 06:17 AM
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You do not have the DMM set up correctly!!!!!!!! You have the range switch set to DC mA, but you have the read lead plugged into the 10 Amp jack. To measure mA and uA, black lead goes in the COM jack and red lead goes in the uA mA jack. Even after all the modules asleep, draw can be as much as 20 mA due to draw from the clock, PCM KAM, etc.
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post #10 of 16 (permalink) Old 07-22-2019, 11:39 AM Thread Starter
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Quote:
Originally Posted by Jeff K View Post
You do not have the DMM set up correctly!!!!!!!! You have the range switch set to DC mA, but you have the read lead plugged into the 10 Amp jack. To measure mA and uA, black lead goes in the COM jack and red lead goes in the uA mA jack. Even after all the modules asleep, draw can be as much as 20 mA due to draw from the clock, PCM KAM, etc.

I know that ideally I would measure in the 400mA one. Problem is that initially there is a power draw of around 1.3 to .7amp which would blow that tiny little fuse instantly. Only after waiting for an hour or so does it drop to what would be safe for that other fuse. And I can't swap them out while testing it either because that would reset the 1hr cool down my car has on entering sleep mode.
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