Follow-up,

The battery has side screw, not top post. I replaced the screws that
attach the cable will no real effect on the voltage when tested again.
I can now hear the solenoid engage and it sound like the starter is
engaging the flywheel but will not turn it. Checking the voltage at
the starter reveals the same values as before.

The service engine light stays on so I will check the codes on
Saturday, to see what that will tell me. I have put a socket wrench
onthe main pulley ( aligns with the crankshaft I believe ) and can
turn it in a counterclockwise direction. You can see the fan belt
move, while doing this, but it is difficult to turn. I'm begining to
wonder if it is the timing chain that has gone out. Is there an easy
way of checking this short of digging into the engine?

Alan