Is .77amp acceptable parasitic draw on 08 f350 6.4L? This truck at work keeps going dead when it sits over night. The batteries were charged on 40 amp for one hour at the same time. One load tested weak and the other almost to weak. Both were full of water. It draws 1.5 amps for the first 30 seconds after hooking up the meter and then it gradually drops to .77 and holds. Nothing is on. All cell phone chargers flashlight chargers and strobe equipment is off. Glovebox light is off. I was told anything over half an amp is drawing the batteries down.

 

I think your issue is the batteries themselves. Time for replacements.

 

I think you answered your own question. If they aren't your problem, then you have to start there and work forward. Do it before you lunch the ficm.

 

I had one weak, pulled down both, replaced both no problem!

 

They had a 3 yr warranty. Ford is replacing them. I hate how the hood hangs down in the front on these trucks. I keep hitting my head on the corner of the hood.

 

I got a ranch hand front bumper.. I have to climb over to get hit in the head!..

sam