Where various lights come on unexpectedly I’ve found it’s poor earths, If you have the wiring diagram , the colours very simple to identify so it would have been either live or negative issue . So remaking the earths around the front grille always a good start, both front and rear left indicators 12v are green/red and come from the same feed before splitting to front and back so work from there towards front indicator and it will be poor 12v wire/connection or earth not working