time to get the VOM and test lamp out
make v-check before starting.. then after starting. first see if the alt is putting out.
if it is.. make sure you are getting 14.4v or so at the bat... ie.. check wireing.
if yes.. then shut down. now put a test lamp inline with charge wire. if lamp comes on.. you have a draw. may be a bad alt ( bad rec pack.. etc.. etc.. )