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If battery only volts are accurate the car shouldn't even start, they give trouble below like 12.3 volt. Good battery runs from 12.3 to 12.8 volt.
 

· C2H5OH
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I've started a Focus on under 11 volts just fine. Depends on how big the battery is though.


Sounds like a problem in the Power Hold Relay circuit to me.
Poor ground/s.
Possibly a bad ECU Diode in the underhood box, though I've never heard of this causing any problems.
 

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Bad PCM Diode = Power Hold Relay will not energize = Dashes on odometer = No Start condition.

Edit: but yes, it does sound like maybe the power hold relay is sticking On some? hmmmm?
 

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Check that you get a Door Ajar caution light when engine on; open and close all 5 doors one at a time. Also test that interior cabin lights turn on and off when opening and closing each door AND the hatch/liftgate.

Lots of stories here about wire damage inside the rubber boot of the liftgate. Inspecting this area should be done once or more during the life of the car.

check this out;
http://www.focusfanatics.com/forum/showthread.php?t=323413
 

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Weird electrical things happen to older Foci. Given that yours is a wagon, Marde has excellent advice...check that hatch wiring! Many, many issues hide inside that rubber boot.

Guessing you have two wires that have no insulation left that are occasionally touching each other and giving power where there shouldn't be any.
 
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