Charging intermittent, sometimes it does sometimes not

Chrysler regulators can vary the current with temperature, even the newer solid state ones.

An intermittent connection could also cause it. I have a finicky jumper wire bypassing my ballast that has caused me a similar issue.

The current will vary depending on electrical load, but the voltage should always remain between 13-14.5 except maybe at idle where it will drop slightly under 13v depending on load (headlights, fans, etc). But over 1k it should be over 13v.