Help no start

[excursionMark]

so this morning it was like 20* or so so i tried to start the truck and it cranked but barely so i figured meh just a dead battery so i jump in my backup pos toyota nd do what i gotta do and when i get back i hook up the jumper cables and go on cleaning my room and such then about an hr and a half later i try to start it and the voltmeter on the dash read right on the bottom line ... so i took out my voltmeter and checked each of the batteries and they each read 12 and change next i tried to turn it over nd it barely moved the starter like it was 1 rev per 2 seconds ... so what could be wrong ... im thinking possibly the connectors to the battery cables (opposite the battery) i already cleaned the terminals ... is that even a possibility idk any knowledge as to what this could be would be greatly appreciated

[thesmokinstroke02]

how old r batteries?

[excursionMark]

2 years or so ... im probably gonna pull them and put my optimas up front and see if that helps but i checked all of them with my volt meter and they all were 12.5 or above ... plus when i tried to start it i had it hooked up (jumper cables) to my toyota

[thesmokinstroke02]

honestly batteries are probably done for. my truck has 850 cold start watt rating and when they checked them at dealership they were at 320 ccw. theyre 11 months old.... thank god for autozone warranties. but yeah have them checked. youd be surprised how much voltage these trucks take to start.

[excursionMark]

sweet lol im gonna swap the optimas real quick and see if that helps the situation ... hopefully it does

[thesmokinstroke02]

yeah hopefully it does. check the GPR also. and also have you had any anti gel in it? where are you located?

[excursionMark]

im in jersey and it has winter blend fuel in it plus the white bottle diesel cleen stuff added to every tank ... and gpr is fine i did the stancor mod last month ... and from one heterosexual man to another i love you ... it was the batteries ... i didnt think it would be that simple but i put my optimas up front and first try it turned over lol...i feel like a retArd but thank you so much for mentioning batteries now i have to go and grab some more opimas for my stereo considering thats where i took them from ... thanks again

[thesmokinstroke02]

lol your very welcome. ive went through the same thing multiple times. they might seem fine but in all reality they arent. most of the time they can crank a car over fine just not a diesel. but im glad you got it all figured out