So what exactly does this mean? Battery no good? Again, I like not having to deal with the AS/S feature, but if the battery isn't up to par I'd like to get things right.

-Erik

 

Did someone disconnect the secondary wire on the sensor on the batteries ground connection? That changes the smart battery charging to dumb charging and disable auto stop. Not a good way to disable it.

 

So much for installing mine this weekend. Mine has been stuck in Warrendale, PA since Monday the day it shipped out. So ready for life to get back to normal.

 

Are we sure that this is not "normal"?

 

The best option here would be to get out a volt meter and find where the system is deficient. One of the previous posts stated he replaced the battery and that worked short term but ultimately the alternator was on its way out. So if you find the voltage that it charges while running and compare it to the service manual, that should tell you if the alternator is good. And of course check voltage of the battery to see where that sits. You can stop at a Autozone or Oreilly’s and they can do a load test on the battery too.

 

charge the battery use a trickle charger overnight or 24 hours. when the trickle charger says (floating) you are good to go.

 

If you will bring up the Dash display in engineering mode and step 42 counts to the system voltmeter, it will tell you in real time what the system is doing at any given time.
After an 8-hour locked truck rest, it will show the state of charge before cranking.

A. An AGM battery in good condition should read 12.2 to 12.4. This value is in Ford's General Bulletin Doc. and is the 75% range that is normal for the system design using an AGM battery.
B. At cranking, the voltage will drop into the 10-volt range. This is normal. Below 10 volts is an indication of battery age even if the battery continues to function properly.
C. After motor starts, the voltage will rise to14.5 - 14.7 range depending on ambient temperature. This is the normal running charging range on a good battery and fault free system. A bit lower on an aged battery.
.
Note: I very recently experienced the end results of replacing an aged battery with a new AGM and see the differences along with BMS reset and removal of stop start function in the program.
.
Any values to far outside these ranges indicate an issue with battery age or charging performance.
A cable, starter, battery or Alternator can be part of any issue.
Alternator control and BUS leads also has 3 codes assigned should the system detect any Alternator performance issues.
.
How to bring up the Dash in Engineering mode. My 2018 XLT as a reference.
1. Press the OK button on the steering wheel left side and hold it.
2. Turn Ignition to ON >only< and wait 30 seconds for the system to act by watching the Dash Screen. Then release the OK button.
3. Use one of the steering wheel left side Quadrant up or down switches to step >42 times< or to the voltmeter display on the >screen<.
Proceed to observe the readings you see for Battery State of Chage, Cranking and Running values.
This Screen display will stay in this Mode until you turn off the Ignition or restart the motor as a reset back to normal.
This function is not in the user manual nor for supporting screen information descriptions.
To bring to you full content and intent requires many words to help you understand.
Good luck.

 

..

 

Ford GSB. 16 pages of info.
In your browser type
static.oemdtc.com/GSB/G0000144.pdf
Good luck.

 

Page 14 is the sensor that some unplug to disable Auto Stop, and why that effects smart charging. Not a good idea to disable Auto Stop that way.