94 chevy pickup 2500 one ton 350 engine

have 1994 chevy 350 pu 2wd automatic suddenly one day I got in my truck and it would not start. I replaced the battery and for 1 1/2 weeks it ran fine then one day I get in and it does it again
it runs down the cell on the battery. have replaced the battery twice. will take any suggestions as where to start. lights work fine,


Okay I replaced the alternator and it was fried as soon as I hooked it up and started the truck now where do I go from there?

dga

have 1994 chevy 350 pu 2wd automatic suddenly one day I got in my truck and it would not start. I replaced the battery and for 1 1/2 weeks it ran fine then one day I get in and it does it again
it runs down the cell on the battery. have replaced the battery twice. will take any suggestions as where to start. lights work fine,

dga

Check the alternator for proper charging.