2014 Starting Problems
 

2014 Mazda 6 Grand Touring. Multiple
instrument light including "keyless
inspection system inspection required"
and "SCBS System" issue come on,
dials flutter. Car starts with jump, but
battery tested fine in all aspects.
Cleaned contacts due to corrosion, but
problem happened again, jump worked
again. Don't think it's alternator since it
continues to run with negative
disconnected. Any suggestions?

Who tested the battery, and how was it tested?

Never ever disconnect the battery with the engine running, you risk damaging several thousands of dollars of electrical modules.