new battery and still dies when i unhook charger/jumper box

[Brevan]

i put in a new battery today and the truck dies instantly when I take charger/jumper box off?
any thoughts or suggestions? truck has ben sitting for like 4-5 months

 

[turkeybird56]

Charging system issues. U gonna have to trouble shoot the system. Now, U know, could be a bad battery also, happens. But really sounds like charge system issue, all IMHO...

 

[Travelin Ram]

If it dies instantly when you disconnect the jumper your new battery is dead.

Only exception is if your battery terminal leads aren’t clean and tight.

 

[Brevan]

Terminals and leads are tight. Guess I'll take battery back to napa. Thx

 

[Oliver Closehauf]

Did you figure this out?

So, just curious, do you have a multimeter? That would tell you the voltage on the battery. Possible they forgot to fill it and sold you a dry battery.

You would also be able to tell if the alternator is charging when its running on the jump pack.

I have not had a chance to read up on 3rd gen alternators, but I assume they need need a certain amount of voltage to establish the magnetic field that creates the current when the alternator spins, which is why it won't run on a dead battery and you can't get it running and then pull the battery like in the good old days.

Multimeters are so cheap and have so many uses, I can't imagine not having one.