Hi 11.8v while trying to crank the engine is ok the voltage will probably drop even more once the starter motor is turning the engine over as someone else suggested I would get the solenoid wire and power it up. the engine should turn over if not the starter motor will need repairing also check your earth and all connections
You can use your volt meter and look for voltages drop.
When you get it all back together I would suggest you fit a slave solenoid to drive the starter motor solenoid this gives the solenoid a hard hit of power if you have any questions hopefully I can help one other thing to try is to rock engine back and forward if the pinion stuck in gear this will free it up
Regards Glen
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