I hav a 1976 dodge w100 plow truck i recently put a new altenator and regulator in but it still seems to lack power when i turn my heater blower motor on high my alt gauge goes way down close to discharge and when i rev up the motor the blower speeds up but the gauge stays the same till i turn the blower off, and it really goes down if i have my head lights on. Its a new battery and i was wondering if i put a dual battery setup in if that will fix the problem. Also my plow seems to lack lift power all connections r thight. Can anyone help me in any way????