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General Technical Chat This section is for technical discussions relating to general maintenance, electrical issues, engine trouble, and recalls.

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Old 02-13-2017, 12:00 PM   #11
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Yea I actually did this over a span of a few days and it dropped slightly but not as much as it normally did while hooked up, I'm guessing the battery quality has decreased now due to constant drain and recharging every other day. I've pulled every fuse in the car and it didn't change but it randomly will be .400 and the car will die overnight or it will be .01 and the car can sit and not die
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Old 02-13-2017, 12:53 PM   #12
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Does your instrument cluster indicate park when you have excess drain on the battery and the PCM will not go to sleep.

May be the selector lever. Have seen that issue on at least one or two F150s. I believe I've also seen it on a few others. On the focus the TCM might do the same.

For that matter any input that would be responsible for waking it could cause it not to sleep.
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Old 02-13-2017, 02:07 PM   #13
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On that model, the charging and electrical management system is way overboard in my opinion and the beauty of simplicity can only be appreciated when problems such as these occur. It is impossible to write everything here so I uploaded some documents from Ford's manual that explain how the system works and suggest ways on how to troubleshoot problems.

Some quick checks - a faulty battery monitoring sensor (incorporated in the negative battery terminal) and failure to reset the battery monitoring system when battery was changed.

Wish you luck.

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