Starter motor - charlotte

Starter motor testing on Pontiac Lemans 1989

Checks: is the vehicle equipped with automatic transmissions? Is the vehicle equipped with any device that requires a power source for its memory?
If it's required a external power supply can be used.
De-activate ignition and fuel injection systems
is the battery servicable.
is the range on the multimeter correct.
is the transmission in neutral.

Checking the avaliable voltage under cranking.
using the multimeter connect the leads to the terminals and crank the engine. Take the first reading you see.
Cranking voltage is 10.87v . This is a pass as it is over 9.5v
Voltage drop on the positive side of circuit. spec is 0.20v . The car tested at 0.09v this is a pass result.
Solenoid main input and output terminal studs. . The spec is 0.10v . the car tested at 0.02v . This is a pass result.
Battery negative and the starter motor whilst cranking the engine. The spec is 0.20v and the car tested at 0.20v . This is a pass result.
The max voltage drop allowed is 0.50v .  The car's max is 0.31v.

Using the clampmeter to measure the amperage of the starter motor. Clamp the meter around the battery terminal wire that is connected to the starter motor, making sure that the meter is set to 400amps DC and reads Zero before testing. The spec is 125-175 amps. Starter draw was 139.1amps. Pass test.

In conclusion the starter motor is in good condition passing visual checks with all the voltage drop tests under the spec. and the amperage within the spec. Overall starter motor is working correctly and no alterations needed.