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GM Tech (Cam)
GM Tech (Cam), Pontiac Technician
Category: Pontiac
Satisfied Customers: 2373
Experience:  GM Grand Master Technician 2007. 14 years experience.
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I have a 2006 Pontiac grand Prix the charging system failure

Customer Question

I have a 2006 Pontiac grand Prix the charging system failure light is on I jumped it off and it started but once I turned it off it would not start so I took the battery to auto zone they charge it and it was still doing the same thing so I then change the alternator and took the battery back to be recharge my car started up last nite but today would not start but I jump it off it starts right up
Submitted: 9 months ago.
Category: Pontiac
Expert:  Roy Belding replied 9 months ago.

good evening my name is ***** ***** I will assist

do you have a volt meter to do some tests??

Roy

Customer: replied 9 months ago.
No
Customer: replied 9 months ago.
I took the battery to auto zone twice to have it charge
Expert:  Roy Belding replied 9 months ago.

can you get one?? we need to do some voltage checks to find out why the system is acting as it is. guessing is not an option as we need information to get you an answer

Roy

Customer: replied 9 months ago.
I do have a battery charger that has voltage reading on it
Expert:  Roy Belding replied 9 months ago.

it will not read charging system voltage

Customer: replied 9 months ago.
I can go to auto zone and buy one
Expert:  Roy Belding replied 9 months ago.

ok, I will be here for a while.

Customer: replied 9 months ago.
Got it on my way back to the car
Expert:  Roy Belding replied 9 months ago.

ok

Customer: replied 9 months ago.
OK I'm back to my car
Expert:  Roy Belding replied 9 months ago.

ok, what is the voltage of the battery with it not running

use the dc volt scale.

Roy

Customer: replied 9 months ago.
1110
Expert:  Roy Belding replied 9 months ago.

11.10 volts???

Roy

Customer: replied 9 months ago.
Expert:  Roy Belding replied 9 months ago.

battery is dead. it needs to be 12.6 volts fully charged. at this voltage, no systems in the car will work as they need at least 12 volts or better. the battery is most likely internally shorted. the alternator will never work as well without sufficient voltage. remove he battery and get a new one.

Roy

Customer: replied 9 months ago.
even with them keep charging the battery
Expert:  Roy Belding replied 9 months ago.

you cannot charge a shorted battery no matter how long you charge it

Customer: replied 9 months ago.
Ok both times auto zone charge it and told me it wady good
Expert:  Roy Belding replied 9 months ago.

trust me, it is no good. they are parts people and not techs at all.

Roy

Customer: replied 9 months ago.
Ok thanks just brought a new battery
Expert:  Roy Belding replied 9 months ago.

ok, did you install it??

Customer: replied 9 months ago.
About to right now
Customer: replied 9 months ago.
Put new battery in and it started but charging system failure is still on dash
Expert:  Roy Belding replied 9 months ago.

ok, what is the voltage at the battery with the engine running???

Roy

Customer: replied 9 months ago.
11.83
Expert:  Roy Belding replied 9 months ago.

ok, what kind of alternator???

check one last thing. the big fat wire at the back of the alternator, check that for the same voltage

Customer: replied 9 months ago.
Duralast
Expert:  Roy Belding replied 9 months ago.

ok, I had a couple of them bad out of the box as well.

if you have voltage at the back of the alternator, then you need to remove the alternator and retunr it and get another new one. have them test the new one before you leave the store

Roy

Customer: replied 9 months ago.
How do I check the wire
Expert:  Roy Belding replied 9 months ago.

with the voltmeter as I stated. put the black lead to the negative of the battery and the red lead to the wire on the back of the alternator

Roy

Customer: replied 9 months ago.
Im new at this do I leave the tester set on battery test
Expert:  Roy Belding replied 9 months ago.

dc voltage with the leads as I told you