The problem with the new starter is definitely the solenoid. I'm not sure if the spring it too strong or the solenoid is not strong enough.
The problem with the old starter is probably that it all the contacts need cleaning, needs new brushes, new bushings, etc. Also, I suspect the solenoid spring is too weak or broken.
The problem with the old starter is probably that it all the contacts need cleaning, needs new brushes, new bushings, etc. Also, I suspect the solenoid spring is too weak or broken.
