You are measuring at the posts, (not the clamps on the posts) and you are dropping from 12.2 V to 3.8 V.
There are two things that can cause this, the battery does not have sufficient remaing capacity to maintain 11 V while cranking or the load in the starter circuit is greater than what the battery can keep up with.
So, bad battery or a dead short.
Some times you can pull the caps and observe the water in the cells. If one is bubbling a bunch you have a bad cell.
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Today's Featured Article - The Day Mom Drove the 8N - by Brian Browning. My Dad was wanting to put in a garden but couldn't operate the 8N and handle the old horse drawn plow he had found and rigged up to use with the tractor. Well, he decided to go get Mom out of the house and have her drive the tractor while he walked behind the plow. You got to understand that while my Mom is a hard worker who will always help whenever she can... she had never operated farm machinery before that day. Dad got her out there, explained how the clutch was the same as in our o
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