Just one big "clunk" As in a "heavy" clunk? Starter or flywheel problems,
Does the engine actually turn with a wrench?
Just one "light" click?
Might be starter relay
Try jumpering across the two large exposed terminals on the relay with pliers / screwdriver
Check voltage at big battery stud on relay with starter engaged. If it's below 10V you have battery / main cable problems
If that is OK, clip your meter to the large battery stud on the starter. Same deal. With relay bypassed, you should have at least 10V at the starter stud. If below that, main cables or dead / bad battery
Remember........"new" parts do not mean "functional" parts
Otherwise, some problem, binding, misalignment in flywheel / bell/ starter.
