Just replaced the starter. When the customer first called on this the complaint was the starter was grinding. Sure enough when I got there the started was not engaging into the flywheel. Then it started doing what I described in the post. I removed the starter and the drive teeth were damaged. Put a new starter on it. Connected the DVOM and checked the battery voltage. The starter worked 3 or 4 times and then started acting up. The battery voltage never dropped below 10.7 volts when the starter worked. As I explained before, I can't get a voltage reading on the solenoid wire or a drop reading because the starter won't stay engaged long enough. I will throw another battery in it on Tues. just to verify, but I believe the problem is elsewhere.