Generator light

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Almost finished with my truck😎. One issue I am having is the generator light stays on. With key on, not running, light is bright. At idle, light is dim. At highway speed light is very dim, and sometimes it goes off. I have an internal regulator alternator. Brown wire to terminal 1, terminal 2 jumpers to 12v at back of alternator. Back wire hooked to 12v terminal by battery.
13.6 v, engine off. 14.4 engine idle, 14.6+ revved up.
I know alternator is charging, not sure where else to look. Thanks for any help.