tahoe wont crank

[shades of shane]

99 Tahoe has a good battery, a good starter, won't crank without jumping off , as soon as jumper cables are removed shuts off.

 

[lesterl]

Is your ground straps and positive leads good (frame to battery, frame to engine, etc.)

 

[Slammed]

Alternator

 

[lesterl]

Battery would keep it running.....

 

[samotahoe]

check fuses