Peugeot/Elddis Accodro 120 Solenoid

Brand new 120 Accordo Peugeot based Motor home, it's now seven months old 2,800 miles on the clock, one afternoon the engine refused to turn over dashboard lights went crazy, so I called out roadside assistance who traced the problem to a solenoid which is situated on top of the engine battery, this solenoid is attached to the battery negative post then to chassis, via cable. I sharn;t bore you with the manufactures response only to say the engine will happily run provided the

solenoid remains bypassed. Has anybody else experienced this solenoid related problem