I went through this last summer.
A F250 diesel needs a unit with at least 3,000 amps.
I tried a 2,000 amp unit and it was just a bit too weak.
Read the specs on the box closely before buying.
Lemme guess, you have two 850 CCA *or higher group 65s) and your jumping it too?
Your problem is at least one battery is totally cooked and your solution is more perceived amps. The resistence for one dog schidt battery is what your fighting.
Two things: ditch the high CCA batteries. Go 750 or 650, or spend more money on a warranty you pay for up front for a system that cooks the [bleep] out of stuff that you dont need.
The ratings on jump packs are not regulated, dont mean squat and arent a solution to your problem...
But Im sure if someone put 5000 amps on a jump pack or 1500 CCA on your group 65s you'd still find the need for a 6000amps/ 2000 CCA to "fix" the pre-engineered problem....
