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I have a 2006 Pontiac grand Prix the charging system failure

Customer Question
light is on I jumped...
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
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Answered in 2 minutes by:
6/22/2016
Pontiac Mechanic: Roy Belding, ASE Certified Technician replied 1 year ago
Roy Belding
Roy Belding, ASE Certified Technician
Category: Pontiac
Satisfied Customers: 6,730
Experience: Master ASE since 1980
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good evening my name is ***** ***** I will assist

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

Roy

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Customer reply replied 1 year ago
No
Customer reply replied 1 year ago
I took the battery to auto zone twice to have it charge
Pontiac Mechanic: Roy Belding, ASE Certified Technician 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

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Customer reply replied 1 year ago
I do have a battery charger that has voltage reading on it
Pontiac Mechanic: Roy Belding, ASE Certified Technician replied 1 year ago

it will not read charging system voltage

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Customer reply replied 1 year ago
I can go to auto zone and buy one
Pontiac Mechanic: Roy Belding, ASE Certified Technician replied 1 year ago

ok, I will be here for a while.

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Customer reply replied 1 year ago
Got it on my way back to the car
Pontiac Mechanic: Roy Belding, ASE Certified Technician replied 1 year ago

ok

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Customer reply replied 1 year ago
OK I'm back to my car
Pontiac Mechanic: Roy Belding, ASE Certified Technician replied 1 year ago

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

use the dc volt scale.

Roy

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Customer reply replied 1 year ago
1110
Pontiac Mechanic: Roy Belding, ASE Certified Technician replied 1 year ago

11.10 volts???

Roy

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Pontiac Mechanic: Roy Belding, ASE Certified Technician 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

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Customer reply replied 1 year ago
even with them keep charging the battery
Pontiac Mechanic: Roy Belding, ASE Certified Technician replied 1 year ago

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

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Customer reply replied 1 year ago
Ok both times auto zone charge it and told me it wady good
Pontiac Mechanic: Roy Belding, ASE Certified Technician replied 1 year ago

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

Roy

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Customer reply replied 1 year ago
Ok thanks just brought a new battery
Pontiac Mechanic: Roy Belding, ASE Certified Technician replied 1 year ago

ok, did you install it??

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Customer reply replied 1 year ago
About to right now
Customer reply replied 1 year ago
Put new battery in and it started but charging system failure is still on dash
Pontiac Mechanic: Roy Belding, ASE Certified Technician replied 1 year ago

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

Roy

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Customer reply replied 1 year ago
11.83
Pontiac Mechanic: Roy Belding, ASE Certified Technician 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

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Customer reply replied 1 year ago
Duralast
Pontiac Mechanic: Roy Belding, ASE Certified Technician 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

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Customer reply replied 1 year ago
How do I check the wire
Pontiac Mechanic: Roy Belding, ASE Certified Technician 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

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Customer reply replied 1 year ago
Im new at this do I leave the tester set on battery test
Pontiac Mechanic: Roy Belding, ASE Certified Technician replied 1 year ago

dc voltage with the leads as I told you

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