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Hi! My name is ***** ***** I can assist you with this. I may need some additional information from you first in order to give a complete answer.
Are these all 12 VDC powered lights and fans? How long has it been since the batteries were serviced and load tested? Most problems of this sort are the result of bad or failing batteries and dirty cable connections. Most RV batteries will only go about 3 years, even with proper service and cleaning. Get back to me with this information and I can offer more here. All follow ups are included in our fee. No time limit.
Just checking back to see if perhaps you missed my earlier responses to your question? Not hard to do considering the volume of e-mail that most of us get every day! If you need me to resend this please let me know. Thanks!