Pontiac grand prix 2ki

Asked by Jul 11, 2017 at 10:40 AM about the 2008 Pontiac Grand Prix

Question type: Maintenance & Repair

I made a horrid mistake after the last night of 5 12
hour night shifts in a row of of passing out in my
car while closing my eyes for "just a second" after
turning the radio on, only to wake 4 hours later with
the radio still on but the engine not even turning, no
clicks or anything. I got a jump, got home, went to
leave last night to find it dead- again. Used my
home jump starter which worked, drove around for
45 minutes thinking that would charge it.

This morning, going to leave and it won't start, and
the jump starter fully charge won't jump it. The
indicator for battery power on the jump starter (
qualitative color indicator) is red as in power low or
dead. I saw a flashing indicator that said power
system failure. I have seen that before when the
battery was low to dead but it went away after i
drove around for 30 minutes. Im guessing if the
battery is critically low it might show that. I'm also
broke until Friday, can afford a battery barely, but i
want to check to see if anyone knows if a battery
of at least several years of age might have the
habit of not being able to charge after fully dying?
Everything was fine before it died.

8 Answers

100,305

Yes that is correct, an aging battery can be boarder line for months until an increase demand is made on it and then it's all done, it won't accept a charge, doesn't have any amps left to crank the engine even though it may show 12 volts there are no amps, another thing trying to use your alternator to charge a battery like this will burn it out, so you may have a two fold problem here, 1 a bad battery and 2 a burned out alternator. So a new fully charged battery first, then check the alternator output, you should be getting 13.8 to 14.2 volts at idle, anything less than that won't maintane the battery. HTH

1 of 1 people found this helpful.

How much attain in this manner would cause a burned out alternator? Car ran fine without any indication of a charging issue and just gave me the charging system problem. Screwed if i have to get a new alternator...

100,305

I have seen alternators actually smoke then quit when subjected to charging a dead battery, there is hope however, if your battery just finally quit accepting a charge it would not activate the full charge from the alternator thus saving the alternator from burn out. Do not try what so many have tried and remove a battery cable with the engine running to test the system, this will cause a voltage surge and fry other electronics. A customer of mine did that on his car and it cost him dearly to get his car running again.

Wouldn't the car stop working mid drove if the alternator were the issue? When i last tried staying it, it was for about 4 seconds tips, and the battery charger fail indicator came up before trying to turn the engine since last driving. The indicator did not come up while driving,however, and if i try putting the emergency jumper parallel to the battery the indicator will not come up. Also the emergency jumper won't start it period, which makes me think the circuit just plainly will not complete since the alternator is on the positive side. I would think a fully charged emergency jumper would at least start, if not maintain ignition no?

Wow, phone, lots of auto correct

100,305

Now it sounds like you may have another problem, possibly corrosion on the battery terminals and or cables as your jump box won't connect.

1 of 1 people found this helpful.

Nothing a bit of DI water with sodium bicarbonate won't fix. That being said, yeah i kind of doubt the alternator is the problem, or really i rather hope it's not since they're hellaspensive compared to a new battery. Wondering if the battery dying completely, or near to, brought it close to total death, combined with rough connections made it rough on shape. It's not totally dead after driving it around. It would drive with streo and air conditioning which makes me think the alternator was providing adequate power to the battery and, I'm guessing it runs parallel to the circuitry that it was, at best, maintaining or barely charging the battery. I turned off all electrical demands aside from the standard state of the car last i drove, didn't seem to help much with charging.

100,305

Ok, so now all you need is a nice hot battery, are you going to go with the normal lead acid type or something fancier like a gel cell or sealed battery.

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