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Hi my name is Robert....
What I would do is check all your chassis battery cables make sure they are not loose, I also might pull the chassis battery and have it load tested to make sure it is good. If the lights are flickering then it could be a voltage issue. IF it is not a voltage or cable issue then it could be more complex and require a mobile tech to come out and hook up to the engine data port and see if any codes are active, if there are codes it will point the tech in the right direction. To me it sounds like a voltage problem and I would start with the cables and having the battery tested, also make sure the main ground to the frame is clean and tight..... Hope this helps some, IF you have more questions or concerns please feel free to contact me.... Robert
Hi I see you have not selected a rating, if you still need more help on this please let me know... Robert