No charge

I have a 2007 tundra crewmax v8 4.7L model. Truck died while I was parked with engine running. The voltage on battery read about 12.5 volts. I got a jump start and it ran for 10 minutes and died again. While running, the voltmeter read only 7.5 volts. I d8sconnected the battery for 10 minutes, then reconnected the cables. Checked all the fuses. And got another jump start from another car. At first it did not even crank at all. I kept it connected to running car and it started back up after 4 or 5 minutes. As soon as I disconnected the cables, the voltage started dripping so quickly from 12.5 to dying and shutting down completely.

I replaced both altenator and battery at the same time a year ago. Fairly new.

Another note, the battery light on the dash board does not come on at all. I read that the light is connected to the alt, in the case the light is blown, the alt does not get the signal to send power to battery. I opened up my dash board and there is bunch of led lights on the electric board. Not like the old school simple light bulb replacement.

I am completely stock. Drained battery. Not crank. Completely dead.

Any help is highly appreciated.

Thank you.

I hope my phone does not die on me as well before I figure this thing out.

 

I'd say your newish alternator is no good.

 

Pull the alternator and take it to your local auto part shop to get it tested. Probably a good idea to get them to charge and load test your battery also.
Just because it is fairly new doesn't mean it can't be dead.

 

Yep, totally agree with this. I purchased 2 brand new batteries recently for other vehicles I have/had and after short usage (like maybe a year or so), both batteries had a bad internal cell which rendered them useless paper weights. Both were replaced under warranty with no cost to me. New parts can prematurely malfunction ...happens way more often than it should. Hell, everything is made in China anymore so I'll just leave it at that.

 

Before you just go tearing it apart, check all the fuses. Get the voltmeter out and verify some power inputs. Just because the alternator isn’t working doesn’t mean it’s bad. Sometimes the trigger to enable the alternator to charge gets cut off by a fuse.