can anyone advise, the green left right repeat flasher light on the dashboard, won’t light up, new bulb fitted, however the green trailer light works and flashes without a trailer attached, all indicators work normally with or without a trailer attached, I guess it could be an Earth issue, the 90 was rebuilt 5 years ago complete rebuild, new galvanised chassis all lights were replaced, all was ok until the light stopped, I thought was just a bulb failure, any thoughts were to start looking