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Q: why wont my 1999 gmc safari hold a charge as far as battery alternator goes. on 1999 GMC Safari

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i replaced the battery 3 times, replaced the alternator 3 times install a new battery cable (positive)replaced the starter, replaced the the alternator plug and check all the fuse in the fuse boxes under the dash and under the hood and still no charge.
No car image 94a1663db56199c5353592009e34aaa51078a2469bed068bb8d6f0ba43accf97
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Pull the alternator off and have it 'bench tested'. IF it checks out good , leave it off truck. Next , fully slow-charge battery and then buy a multi-meter. Then get a wiring diagram of charging circuit and perform input/output and continuity tests on appropriate wires. Probably failed signal wire to alt. VERIFY FIRST!!! Before putting on more parts.........IF alt. bench tests bad then have the next one you get bench tested before you leave the store with it. Then troubleshoot vehicle before installing alt. Good luck.
Bench tested by whom? AutoZone? Heck NO! They think anything with "duralast" on it is good to avoid warranty issues and fail anything else that comes in...to sell a "duralast".
wow, three batteries and three alternators...why didn't you get ANOTHER alternator? anyway, Jae Mak...sounds like you have an issue with the alternator not charging...you have to find out what wire is missing or broken.
I UNDERSTAND YOU WANTING TO FIX THIS YOURSELF BUT IT IS TIME TO GO SEE A MECHANIC!!
THE REPAIR SHOULD NOT COST YOU A BUNCH. DON'T BE DISCOURAGED THOUGH YOU WERE ON THE RIGH TRACK.
Are you saying that the battery wont hold a charge or the charging system isnt working? It the battery is losing the charge, (it goes dead) after a day or so then you should be looking for a current draw. Something is staying on and killing the battery. If the charging system isnt working then you need to do some diagnostics to see why the alternator is not doing its job.
the charging system is not working properly even after all the repairs i recently made to it
CHECK THE BIG RED WIRE ON THE BACK OF THE ALT. SHOULD BE BATTERY VOLTAGE IS IT? WHEN YOU INSTALLED THE ALT WAS THE BATT. CHARGED UP BEFOR YOU STARTED THE ENG. AND NOT JUST JUMP STARTED? 9-10 VOLTS YOU NEED TO HOOK UP A CHARGER AND GET BATTERY TO FULL CHARGE THEN TRY CHECKING VOLTAGE. THIS IS SUPPOSED TO BE AN EASY ONE. BUT SOMETIMES WELL.
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