Used to own a Toyota. It had an alternator with brushes. Brushes wore out, so the alternator died. It cost $200.00 to buy a new alternator. They had been intentionally designed to make it impossible to simply replace the brushes. And you had to give Toyota the old one back so they could replace the brushes and resell it for $150.00. I'll never buy another Toyota. Problem is, more and more auto makers are designing repairability out and forced replacement in. In a few years it'll probably be mandatory to repair a bad starter solenoid by buying a complete new engine and transmission unit.