https://www.looper.com/1388978/why-larry-wilcox-left-chips/

Larry Wilcox was a consistent presence on "CHiPs" as Jon Baker, until he departed the series prior to its final season. Here's why the actor left.

Ego

And I think both of them had one. And there's no doubt that Erik was considered to be the upcoming break out star of the series. I won't debate who was the bigger hunk, but it's obvious that the Larry and Erik never got along from the get-go.

What is clear about TV is that it's insanely competitive with numerous variables that keeps an actor in or out of the saddle (keep working in front of the camera).