My brother just bought a 77 w150 (318/727/203). He had problems with the carburator, so after a rebuild we thought it would be ready. Someone left the key on overnight, and drained the battery( no biggie), after a 8 hr charge, we still had no power at all! No dash lights, headlights, dome lights or anything. We changed the starter relay, that looked pretty nasty, but still have no power. Any suggetions would be appreciated thanks.