2022 RAM Hemi 6.4L not starting

[Jacobmatt]

The truck recently had spark plugs replaced, when trying to start all the power was cut to the vehicle. We tried jumping it but all the power immediately gets cut. I checked all of the fuses pertaining to the ignition and they were all fine. When the truck is connected to another battery source the lights will turn on. We are stumped, any ideas?

 

[Fatherof3]

What year and how many miles ?
It sounds like the battery .

 

[23RAM]

The truck recently had spark plugs replaced, when trying to start all the power was cut to the vehicle. We tried jumping it but all the power immediately gets cut. I checked all of the fuses pertaining to the ignition and they were all fine. When the truck is connected to another battery source the lights will turn on. We are stumped, any ideas?

Will the truck start with another battery source?
If not, then it's not a battery issue.

You said the plugs were replaced recently. How recent? Perhaps the worker loosened or damaged something.
Or maybe the alternator plug was loosened or pulled off reducing charging output which weakened your battery as it wasn't getting charged properly.
A loose serpentine belt will slip on the alternator pulley which reduces charging output too.
Bad coil packs.
ECU problems.
Water incursion.
Plus a hundred other reasons...

 

[jljbtm]

I had a no start recently with my 5.7 and 86,000 miles where a bad engine ground wire had enough corrosion (resistance) that it would not start .Try grounding your engine to the battery!?