I looked at this as a Crank but No Start this morning, Driver complains that it has been difficult to start for some time now. Immediately I did not like the sound of the starter motor.
Adding a Battery booster and it started, drove it for 10 minutes. Then checked Battery voltage after 10 minutes - 12.8v, Disabled fuel and got this cranking :
All I can see for now is that amperage is high, and RPM is really low. Am I right?
Can you do another capture with battery voltage also? If it is too low it may point to a battery problem I guess.
Try with the booster connected (higher feed voltage) to measure the starter current. If it is much lower, I guess the battery is the problem, not allowing the starter to get to the right RPM.
I did take Starter and Battery Voltage but unplugged the USB and poooof - it was gone !
A new starter motor was ordered by the garage on my say so.
The feedback is this: One of the 3 bolts was missing so the Starter was moving, a fine explanation ?
The Earth Strap that could sustain 600 Amps was corroded and needed cleaning - I think his glasses needed cleaning
With the replacement starter, all 3 bolts tight, it spins better and faster, sounds much better when cranking and starts quicker.