1996 chevy tahoe

Are you saying it cranks good but won't start? If so, you check the basics, have a helper crank it while you visually check for spark at the plugs, proper fuel pressure, fuel injector pulse? Any applicable trouble codes? Make sure battery has a full charge and connections all good. Now, if your saying, the starter won't crank the engine? Check the starter circuits, two voltage circuits at starter motor, one comes from battery, hot all the time, The other circuit goes hot with key in the crank position wired through neutral or clutch switch, and you have a starter relay according to my info. The starter motor grounds through the engine block. It may be possible to pull the starter relay, and use jumper wire on switch side of relay, one of those terminals is hot all the time, the starter motor should crank the engine. If you try that, make sure tranny is in park or neutral and parking brake is set.

it starts after a jumpstart but the second you turn it off its dead again

like its dead then i jump it and it runs then when i turn it off its dead again then i have no power and it wont even tick when i try but if i take the battery out and charge it it will run for 3 days before it has this issue again but the only thing i think could be the problem is its a side post and when i bolt the positive and negative wires in the positive is stripped out inside so i wonder if that' s where the bad connection is coming from.