Can the potential relay go bad cause the start cap to go bad also?

Yes, a failing potential relay can cause the start capacitor to go bad. If the relay does not open or close properly, it can result in the capacitor being subjected to excessive voltage or prolonged operation, leading to overheating and eventual failure. Additionally, a malfunctioning relay may prevent the compressor from starting or running efficiently, putting further strain on the capacitor. Regular maintenance and timely replacement of faulty components can help prevent these issues.