Chevrolet Repair: charging problem, 1993 chevy lumina, chevy lumina

Question
QUESTION: I have a 1993 chevy lumina van.the alt light is on.I had the alt tested and the batterey. Both good. Is there something else I need to check?

ANSWER: HI JOHN,IF NO OTHER PROBLEMS ARE NOTED,SUCH AS NOT STARTING !! THIS MAYBE A GROUNDED SIGNAL TO THE DASH GAUGE..  I DO NOT KNOW HOW YOU CHECKED THIS,IF IT WAS WITH A VOLT METER AT THE BATTERY IT MAY LOOK LIKE IT IS CHARGING BUT MAY HAVE A BAD DIODE. SO CHARGING BUT,,,NOT CHARGING TO SPECS WITH A HEAVY LOAD ON IT... CAUSING THE LIGHT ON. I WOULD REMOVE THIS ALT AND TAKE IT TO A PLACE THAT WILL CHECK IT ON A CHARGING SYSTEM STATION AND MAKE SURE THAT ALL THE INTERNALS ARE GOOD.  THIS DOES SOUND LIKE A FAULTY ALTERNATOR. WE HAVE VERY FEW PROBLEMS WITH THE ALT DASH LIGHT CIRCUIT. HOPE THIS HELPS YOU ...

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QUESTION: Alt tested good and battery good. Still not charging. where would I find the fuseable link I heard about? Could the starter stop it from charging?
Starter works fine though

Answer
HI JOHN,THE STARTER HAS NO BEARING ON THE CHARGING SYSTEM WHAT SO EVER. THE FUSEABLE LINK MAYBE
ON A SMALLER RED WIRE GOING TO THE MAIN POST OF THE STARTER OR IT MAYBE ON THE POSITVIVE BATTERY CABLE TOWARDS THE BATTERY ITSELF. USUALLY IF THIS FUSE IS BAD THERE WILL BE NO POWER INSIDE THE CAB EITHER. DO YOU HAVE A TEST LIGHT ??? IF SO TEST THE BIG RED WIRE ON THE BACK SIDE OF THE ALT IS IT HOT.12 VOLTS ??? IF NOT FIND THE PROBLEM WITH THIS WIRE,THIS WILL GO TO THE BATTERY OR FUSE BOX IN ENGINE BAY AREA...ALSO CHECK ALL THE FUSES IN THE ENG BAY AREA AND INSIDE FUSE BOX AS WELL. IT IS POSS YOU HAVE A FUSE BLOWN TO THE REGULATOR CIRCUIT THAT PREVENTS THIS FROM CHARGING.. I WILL ALSO ASSUME THAT YOU BROUGHT THE ALT TO A PLACE THAT CKS THIS ON A CHARGING SYSTEM MACHINE ??? GET BACK TO ME AFTER YOU HAVE CHECKED THESE ITEMS OUT ....