Originally Posted by Gary McDade
12 volt lights dim and get bright on 30 or 50 amps. On Montana Mountaineer. Does not do it on 110 electric. Battery is 1 year old, has 12.4 volts. Has anyone had this problem? Or any suggestions to the problem? Thanks!
Welcome to iRV2.
30 amp service IS 110 volts of supply with a 30 amp load limit .
50 amp service IS 110 volts of supply with two lines with, 50 amp load limits.
When you are on shore power , be it 15,20 ,30 or 50 amp . it's always 110 volt.
Your RV's on board , converter/charger ( or inverter) will supply the power to charge the battery and all the lights at a rate of 13.1 to 14.1 volts , so it will provide brighter lights, than when you are using battery power alone.
Check your battery's electrolyte level and clean the connections , do this monthly if the RV is always plugged in.
More info at this site.
The 12volt Side of Life (Part 1)