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Old 01-22-2017, 04:13 PM   #11
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I actually have a load tester, totally forgot until mentioned here. But even if it shows good, doesn't mean it won't give it up two days later. I guess I'll just keep an eye on the monitor and keep some jumper cables in the back.
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Old 01-23-2017, 08:29 AM   #12
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Quote:
Originally Posted by Ldsundance View Post
since you have a lighter socket voltage meter dont worry to much if your driving and the voltage reads 12.2v for a while this is normal with fords smart charging the battery only really gets charged to about 80% to prolong the life
Just wanted to add that if you have a voltmeter plugged into your power port, you can see the voltage fluctuate in real time. However, if you use the information center in your dash cluster, the voltage will be a snapshot of the current voltage. It will not update the voltage reading until you refresh the display.
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Old 01-23-2017, 09:15 AM   #13
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Quote:
Originally Posted by wavsine View Post
Just wanted to add that if you have a voltmeter plugged into your power port, you can see the voltage fluctuate in real time. However, if you use the information center in your dash cluster, the voltage will be a snapshot of the current voltage. It will not update the voltage reading until you refresh the display.
Good to know!
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Old 01-23-2017, 04:12 PM   #14
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Quote:
Originally Posted by wavsine View Post
Just wanted to add that if you have a voltmeter plugged into your power port, you can see the voltage fluctuate in real time. However, if you use the information center in your dash cluster, the voltage will be a snapshot of the current voltage. It will not update the voltage reading until you refresh the display.
I wouldn't worry about the voltage fluctuations since the is part of the alternator load shedding.

As long as the battery is higher than 12v when running it's fine.



If you guys want to read more about the BMS Load shedding ------>>> Phantom Battery Light
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Old 01-23-2017, 06:00 PM   #15
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Will the charging start acting weird when the battery starts to fail?
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Old 01-23-2017, 06:14 PM   #16
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Quote:
Originally Posted by got3fords View Post
Will the charging start acting weird when the battery starts to fail?
Load shedding will not happen if the state of charge is bad (battery can't keep up).

First thing to notice is the low battery message cut-off on the radio after few minutes with engine off.

But you can't beat a rested battery (2-3 hours after engine shutdown) and voltage measurement at the terminals with a multi-meter.


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Old 01-23-2017, 08:44 PM   #17
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Quote:
Originally Posted by ELCouz View Post
Load shedding will not happen if the state of charge is bad (battery can't keep up).

First thing to notice is the low battery message cut-off on the radio after few minutes with engine off.

But you can't beat a rested battery (2-3 hours after engine shutdown) and voltage measurement at the terminals with a multi-meter.


Good info! So if I never see the state of charge drop below 14V, does that indicate pending doom? IE no load shedding?
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Old 01-23-2017, 08:59 PM   #18
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Heat is the main killer of batteries. Ford put ours in a bad spot. My first just died without warning I'm on my second battery. Also, both motorcraft from the dealer. My next one will be another brand.
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Old 01-23-2017, 09:45 PM   #19
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Quote:
Originally Posted by got3fords View Post
Good info! So if I never see the state of charge drop below 14V, does that indicate pending doom? IE no load shedding?
There is so many factors in play with the charging system.

Many things could make the intelligent charging off. (alternator always charging)

Like a bad BMS sensor (the one on the negative terminal)

High electrical load

Short trips (battery always need charging)


So by saying if the voltage is always 14v or more when engine is running the battery is going bad that would be inaccurate.


If you really have doubt about your battery get it load tested.
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Old 01-23-2017, 10:13 PM   #20
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Load test is pretty good for security, battery will fail that long before it quits on you to cause issues barring a VERY unusual situation.
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