Alternator tests good, but lights flicker dim, and wont charge battery

NO ENGINE TOLD ! 2.0 OR 2.5LITER?????????
TH 8TH DIGIT OF YOUR VIN TELLS YOU WHICH ENGINE IS THERE, PLEASE TELL THAT FIRST.
The alternator is overcharging. what makes you think so?
a meter test.?
scan tool shows DTC that said that>?
OK JUST FLICKER,
lights flicker, what light, heads, or charge lamp error
or what? (i guess all)
putting in 3 wrong alternators is painful , there are 2 used, here. on 2 engines
one is pcm controls, other is not.
The 2 engines and matching ALTs:

DURATEC -VE 2.5LITER ONLY

ZETEC-VCT 2.0L ONLY

THEY ARE NOT THE SAME. ALT ! NOR ENGINES

DURA HAS 3 FUSES TO BLOW. BOTH ALTS USE THESE FUSES
F30-CJB. 7.5a, CENTERAL JUNCTION BOX.
and F2 =BJB, 15AMP BATTERY JUNC. BOX BJB
AND FB 175 AMP
THE REG IS INSIDE THE ALT HERE, NOT PCM

DID YOU REPLACE THE ALT WITH THE NEG LUG ATTACHED, IF YES, THE 175AMP FUSE IS BLOWN BOOM

ZETEC USES PCM REGULATION

AND SAME 3 FUSES TO FAIL, 1,2,3..

THE 175 FUSE MUST BE GOOD. TOO.

THE CORRECT GENERATOR FOR YOU ENGINE MUST BE USED
THE DURA and zetec alternator gens can NOT be mixed up here ever!

best way to buy any alt is by VIN # code or fail 1/2 the time or even 3times in row. or 175amp is blown
if buying over the counter (a new alt) tell them there 2 kinds used in 2000, tell them the vin 8th code.

Diagnosing Common Automotive Charging System Problems

www.onallcylinders.com/.../diagnosing-some-common-charging-system-...

Sep 18, 2013 - Flickering gauges. ... Problem: The charge indicator light flickers while driving. .... My alternator has been replaced for the third time in 5 months. ... I bought a new regulator but it is still doing the same thing... .... my headlights wont turn on, car runs fine when jumped, battery last for maybe 3 hours, any ideas ...

All lights Flickering/Pulsating only when motor is running ...

www.cadillacforums.com/forums/cadillac-forum/t-221843.html

Feb 11, 2011 - So i have noticed for a while now that all my interior lighting (radio, tach, even ... Installed the battery and have not had issues starting since then. ... So now ipurchased a new alternator "just in case" figuring i would eliminate the .... Interior lights and headlights still seem to pulse/flicker while idling the most, ...

Lights Flickered. Replaced Alternator. Now more flicker? - Camaro ...

www.camarozone.com/.../lights-flickered-replaced-alternator-now-more-...

Apr 22, 2013 - 20 posts - ‎4 authors

Combination of brake and battery light mean the alternator is not charging. after you wait for a wile the battery recover some power and will run again but as soon the power drop below 9V the engine die. Test the charging system and replace the alternator
Good Luck

It could be a couple things. Take it to a shop or a place like auto zone and have them test the alternator and the battery, its free :) If they both are testing as good, the next thing would be to check the battery terminals and connections. It simply is not getting the enough charge back to the battery for one reason or another.

The only thing i can think of is to make sure you have a good ground to your alt, and body...

Well that is a good and easy test. The alternator you just replaced is probably bad. Once the vehicle starts its the alternator's job to keep the vehicle running. You need to take that alternator back to the auto parts store and exchange it for a good working one.

I hope this helps you out, if it does please give me a YES that I did help you correct your problem. Thank you.

Suggest replacing the the switch for the headlights or the switch for the dimmer...doesn't sound like it's your charging system, but more like a switch. There are probably relays involved too, usually in the Fuse Box, that may be suspect.

Good luck,
Td

Sounds like a low voltage problem, alternator not charging properly. When you press the gass the motor takes more juice from your battery to fire the spark plugs have you had your charging system tested (most auto parts places do it for free)? Either that or a loose wire causing the short. Check all grounds under the hood and make sure they all have a good contact

check fuses alternator fuse ,charge fuse.also if that checks out look at the harness for back of alternator is it in bad shape? is there a large wire by it self bolted on the alternator? if so take a wire ,same size,and bolt it on with that wire and run it directley to the positive battery post this will charge battery for now on,but if u dont have a large wire bolted on alternator ,the larger wire that is pluged into the alternator is the same wire ,tie into this wire really good and do the same (run to battery positive post) make sure this plug in is good ,if not u can purchase this at the zone

what probley happened the alternator started to heat up alittle to much and caused the belt to spin on the pulley i would go ahead and get the alternator replaaced as soon as possible. as for the lights dimming and the gauges not working you was running off your battery making the vehicle mess up i would also get your battery checked while your at it.