Omega B – FL – Both warning numbers remain silent?

Hello, In my Omega BJ 1998 I don’t have a warning number for light / parking light. Unfortunately I forget to put the turn signal back, then sometimes the parking light stays over the whole weekend on and Mondays the battery is empty. Can I retrofit a Summer Relais 90 240 665 or other and on which slot comes the relay? In Voaraus thank you very much! Greeting Remy