Hi, my battery was discharged after a while of listening music with the engine off, so using another car there was a polarity mistake blowing the 100 amp fuse (on the Positive terminal of the battery itself) and sometimes the car doesn't start at the first attempt,

using a cheap OBD Scanner and torque the ECU doesn't provide any error, the lights ok, and the fuses under the hood were re-checked, so I'm looking for ideas about damage in the starter in order to buy it from a local shop (no dealer), anyone knows y autozone can diagnose 100% secure such kind of damage? or is better to a repair shop? also the part # would be great if someone can help, the FIT is a 2015 CVT

any ideas are welcome, Thanks

 

i replace the battery every 8 years...i would replace battery first and see if all OK before proceeding with other repares