Hello !
Remove the starter and bench test it, looks to me like the solenoid contact its damage or broken (the starter has power all the time by the positive wire from the battery) and the power "flows" inside to the starter motor.
99% sure of that`s the problem, check that and comeback with your findings.
Good Luck!
Monday, November 11th, 2019 AT 6:07 PM
(Merged)