I have a 1996 Chevy Silverado truck, the battery is new and the engine pulls the battery down. I have had the alternator tested and it's not that. What could it be?

you need to do a batt. draw test. do you have a test light? mws919

I have a volt meter. How do I do a battery draw test?

put the test light between the neg. batt. term. and the neg. cable, remove hood light and keys fron ignition. the light should be on if a draw is there. now you'll have to start removing one fuse at a time until the light goes out. the fuse that made light go out, is the circuit that has the draw. see what is on that fuse, ie glove box, radio, ect..., and check the items on that fuse. remember to install each fuse that did not stop light, so they are not all out at once. the doors will have to be closed for each check.