that Powermaster should be an all in one charger/distribution thingy. Sounds like the charger has given up and replaced with an after market unit.
If it is a trickle charger it may not be charging the battery enough when you are running lights etc. Other issue can be overcharging a battery which will reduce its lifespan
If it is a trickle charger it may not be charging the battery enough when you are running lights etc. Other issue can be overcharging a battery which will reduce its lifespan