Hard cranking after new batteries. help

[Maxont]

Slow cranking like batteries are dead.

I have read the computer will not operate correctly when battery voltage hits around 10.5v.(not sure how true this is) I just replaced both batteries because the old ones were definatly starting to die out and the truck would barely start. Now that i have replaced them the truck does start better but it still seems to be having a hard time. I noticed the battery light blinks while cranking(i dont think it did this before) and the voltage while cranking drops to 10.5. Brand new 850 cca interstates. Any idea what the problems could be? Starter/solenoids? im not sure how these die out on these trucks.. if its like a steady problem that worsens or if they just flat out stop working... any suggestions will help

i noticed it is worse when the truck is cold.
Bats charge at 13.9v

check the connections at the battery, grounds, and starter

[Maxont]

battery grounds are good, connections are good, havnt checked the starter yet... i thought about it but its been raining and i dont wanna go lay in any puddles

a bad connection will cause it to act like the batteries are dead... even check the wire going into the battery clamps...

[blue72]

Weak batteries will kill your starter. Take it off and get it tested, almost positive it is your starter. My truck cranked slow, batteries tested fine. Replaced starter, and now cranks like new.