I have a multiplus 3000 12v/240v system. My generator is hard wired to unit with a 3 pin plug to generator. When pluged into my diesel generator the unit works fine but when i change to my petrol generator using the same cable the multiplus unit swictchs to genrator for 1 sec then switches back multiplus and keeps tring to conect generator but fails every time. Yet works fine when connected to my diesel generater. The generator brand is Ducar made in china.