Headlights of Espace II too dim due to voltage drop

Dear,



Due to a voltage drop of 1.6 V (left) and 1.1 V (right) at the dim lights (between battery + and the bulb) the lights are too dim. The main lights are OK. The connectors and cables look normal. I already checked the lighting switch but I realized that relays should be somewhere. The relays are my second target. Where can I find the relays ?



Thanks for your answer and best regards,

Carlos