2007 Denali ? GMC Yukon Denali ? doesn't matter , it's not charging ? before replacing the alternator did you have it checked ? Is there B+ voltage on the heavier gage wire on the back ? Is the battery light symbol lit on the instrument cluster ? This charging system is computer controlled .
Electrical Power Management (EPM) Overview
The electrical power management (EPM) system is designed to monitor and control the charging system and send diagnostic messages to alert the driver of possible problems with the battery and generator. This EPM system primarily utilizes existing on-board computer capability to maximize the effectiveness of the generator, to manage the load, improve battery state-of-charge and life, and minimize the system's impact on fuel economy. The EPM system performs 3 functions: Your best bet would be to have a qualified repair shop test the system .
SOURCE: 1999 Volvo S80 will not hold a charge
Tricky ... Was the alternator replaced with a 2nd hand one or a new one?
A defective alternator can allow the battery to discharge within a few minutes (the diodes in the rear of the alternator can burn out and cause the problem. The diode pack can be replaced). When this happens recharging the battery only replaces the power in the battery - which drains straight back to earth via the alternator, flattening the battery again - often within a couple of minutes or less.
Does the battery lose its charge when the car is standing or just when the engine is fired up?
If the battery loses its charge overnight, try disconnecting the wiring from the rear of the alternator (also look at the electrical connector that fits into the back of the alternator - look for melting/burning marks which suggest something may be amiss inside the alternator).
Let the car stand overnight with the alternator wires disconnected. Will it start up ok and drive (with the alternator wires still disconnected) the next morning?
You could also try just disconnecting the alternator wires, firing up the car and then driving it -
If the car drives ok without dying out and gets further down the street than it usually does, then it probably is the alternator at fault. The car should drive until the battery drains and has insufficient power to trigger the ignition. You certainly would get further down the street with a charged battery and disconnected alternator than you currently do.
It does sound as though you've had an alternator fault to begin with. If it has been replaced with a 2nd hand unit that unit may also be faulty. Rather than replace parts in desperation, visit an auto electrician's - within a few minutes they will be able to test the battery/alternator output and also identify where the lost current is going. It will be cheaper in the long run to have an auto electrician look at the charging system. It only takes a few minutes.
SOURCE: I HAVE A 94 JEEP
Check the Belt Tensioner. If the Tensioner is not Keeping the Belt Tight it will Drain the Battery Pretty Fast.Please Rate my Response, I need all the Help That I can Get! Thanks!
SOURCE: Battery replaced - won't hold a charge. Is the alternator the problem?
THE BATTERY IS ONLY FOR STAR THE CAR. WEND THE THE CAR IS RUNIG ALTENATOR IS CHARGING THE BATTERY FOR NEX TIME YOU NEED TO STAR THE CAR . CHECK CHARGE ON THE ALTENATOR . IF ALTENOTOR NO CHARGING REPLACE.
SOURCE: new battery and alternator. Battery still won't hold charge
Check all your fuses if you had a system failure it could have blown a fuse. I am not sure on your vehicle where the fuse is in the car or under the hood it could also have a relay. You can check your alternator by checking the voltage at the back of the alternator where the big wire bolts on. You should have 14+ volts at the alternator.
SOURCE: Won't hold a charge
Sounds like good answers...most likely the battery has a bad cell...you can get a free test at most parts stores...(Take your jumper cables with you, so you won't be stranded...Hope this helps.
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