thank you
thank you for your answer but after locating the yellow flag you mentioned (which by the way was mounter on the outside of the battery box near the top) and resetting it , the problem still exist's, no power to anything with or without the battery connected and when the cables are connected and the motorhome engine running the motor stalls out to almost stopping and then runs for a few seconds then stalls and repeats. I don't want to run the engine with the cables connected as I don't know how or why it affects the engine
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