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Ask GM Tech (Cam) Your Own Question
GM Tech (Cam)
GM Tech (Cam), Pontiac Technician
Category: Pontiac
Satisfied Customers: 2376
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: 1 year ago.
Category: Pontiac
Expert:  Roy Belding replied 1 year ago.

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

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

Roy

Customer: replied 1 year ago.
No
Customer: replied 1 year ago.
I took the battery to auto zone twice to have it charge
Expert:  Roy Belding replied 1 year 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 1 year ago.
I do have a battery charger that has voltage reading on it
Expert:  Roy Belding replied 1 year ago.

it will not read charging system voltage

Customer: replied 1 year ago.
I can go to auto zone and buy one
Expert:  Roy Belding replied 1 year ago.

ok, I will be here for a while.

Customer: replied 1 year ago.
Got it on my way back to the car
Expert:  Roy Belding replied 1 year ago.

ok

Customer: replied 1 year ago.
OK I'm back to my car
Expert:  Roy Belding replied 1 year ago.

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

use the dc volt scale.

Roy

Customer: replied 1 year ago.
1110
Expert:  Roy Belding replied 1 year ago.

11.10 volts???

Roy

Customer: replied 1 year ago.
Expert:  Roy Belding replied 1 year 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 1 year ago.
even with them keep charging the battery
Expert:  Roy Belding replied 1 year ago.

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

Customer: replied 1 year ago.
Ok both times auto zone charge it and told me it wady good
Expert:  Roy Belding replied 1 year ago.

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

Roy

Customer: replied 1 year ago.
Ok thanks just brought a new battery
Expert:  Roy Belding replied 1 year ago.

ok, did you install it??

Customer: replied 1 year ago.
About to right now
Customer: replied 1 year ago.
Put new battery in and it started but charging system failure is still on dash
Expert:  Roy Belding replied 1 year ago.

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

Roy

Customer: replied 1 year ago.
11.83
Expert:  Roy Belding replied 1 year 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 1 year ago.
Duralast
Expert:  Roy Belding replied 1 year 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 1 year ago.
How do I check the wire
Expert:  Roy Belding replied 1 year 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 1 year ago.
Im new at this do I leave the tester set on battery test
Expert:  Roy Belding replied 1 year ago.

dc voltage with the leads as I told you