If they are TIGHT, then you have a dead battery.

If it starts with a quick jump, then either it's the battery/post connection, OR the battery, because you are applying the jump cables to the terminals, not the posts.

Voltage is irrelevant if the amps won't come out to play.....


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Get a new battery. Optima Batteries do not survive complete drain....

then either disconnect it or buy a trickle charger next time you let it sit for more than a week or so

 

I checked the fuses tried to start it nothing . tried push starting nothing

 

main power fuse. 120A, its located on the side of the fuse box under the hood

 

my x8 wont start or crank when I turn the key everything dies, i tried jump starting her up and nothing, battery has juice, have a new starter and spark plugs in already any suggestions I have a video to post as well

 

check fuses and battery terminals