Anyone know how to fix one chargeing system

-If I were you have load tested at an auto parts store such as NAPA to check its condition-start here

INITIAL CHECKS
Before proceeding with charging system diagnosis, ensure:
Battery is fully charged and in good condition
Battery cables are in good condition with connections clean and secure
Alternator belt is in good condition and properly tightened
Alternator and SBEC wiring harness connections are clean and tight.
Engine ground strap is in place
UNSTEADY OR LOW CHARGING
Check for loose alternator belt, charging resistance too high, defective alternator, loose alternator ground wire or corroded battery terminals.

Chedck and test the fusible link and the dark blue at the alternator for battery voltage coming from the ignition switch

What do you have on the dark green wire?

Do this get a multimeter read the battery voltage before you start the vehicle-record it, now start it up and read the voltage again-let me know the readings

Its not charging-have the alternator load tested

If it checks out-you have a wiring problem I've given you all I got, this is as far I'm gonna take you-sorry