03 6.0 Battery issue????????

[powerstrokin999]

My truck has 127000 and I went to work this morning the truck seemed fine.. when I went to start it at lunch the truck sounds like the batterys are dead.. but I tested them as they sat at 11.9 volts cold.. which I thought was pretty good.. anything will help I just need to get it running by the time I am off of work.. Thanks!!!

[dannyboy950]

With your batteries reading that low you are probably drawing down below 10v at which point the FICM and PCM will not work below 10v.

[jesilvas]

Test each battery separately. And load test also.

[southend]

bad battery(s)

[Pistolgrip426]

Those are good enuff for a gasser, but not a psd. I have the onboard factory volt meter /rpm controller in my truck, i can tell my alternator or a batt. Is going bad before an idiot light comes on, koeo, they are always 13.8, 14.1 going down the road.

[joe_r_dog]

Agreed with load test. Free at napa. Test batteries individually and alternator. Replace with 850cca's or better. I was surprised at how fast mine turns over with new batteries.