[rokndad]

How old is (are) the battery(ies). A cell can go dead instantly even with a virtually new battery. Sealed or caps with electrolyte? I don't know what tests you can make at home, but certainly a good repair shop can tell you if you have a dead cell or cells. Sometimes they'll be good for several months or even a year then die instantly. Has the car sat for any length of time without starting? My new batteries' info sheets informed me that they need to achieve at least 110% charging after each start to keep the charge at optimum.

I had 13.8v across my two batteries and they both had a deal cell each. They were only 20 months old. Prevented the MSD ignition from seeing the correct voltage while cranking. And it cranked fine. Just wouldn't start.

Agree to first check for clean cable connections, then have the battery checked that it's taking a charge and then holding it. Best of luck.