Strange Starting problem

[Txramtim]

Hi all

I own a 2020 3500 Laramie Dually. 24000 miles on it. This morning I went out to drive it. Closed the door, foot on brake, hit the start button. It’s about 50 out and hasn’t driven for about two weeks. Got the message about it warming and to standby for auto start. After the countdown meter went away, I got several messages about service the anti skid brake and trailer brake (no trailer hooked up) and then a loud almost glass cracking sound pop then it went dark. I checked both batteries with a volt meter and both show a 11.9 volts.

Allowed it to sit and same results. All accessories appear to work. AC radio Lights etc. no weird flashing or relay clicking other than the loud single crack sound right after the preheat meter goes down to zero

Any help or advice would be much appreciated

Tim

 

[Travelin Ram]

Your batteries are dead. Charge them.

 

[Mister Luck]

11.9 is extremely weak less than 50% if you batteries ever go 10.5 unless they are deep cycle you would probably need to replace them.

 

[Txramtim]

Thank you for the fast replies. I was under the assumption that 11.9 was still ok and enough to at least turn it over. I will find a battery charger and charge them

Thank you
Tim

 

[Travelin Ram]

In older vehicles, a low battery would give you a slow crank. Newer computer controlled ones won’t do that, because as soon as it tries, the voltage drops too low and the computer dies. The computer is more voltage sensitive than the starter motor.

 

[Wild one]

Thank you for the fast replies. I was under the assumption that 11.9 was still ok and enough to at least turn it over. I will find a battery charger and charge them

Thank you
Tim

Heat kills batteries fast,and it looks like you live in Texas,you might be due for new batteries as the ones in your 2020 are 4 years old now,which is about the life expectancy of alot of batteries that endure a fair amount of heat