LEGO 9 V Volt Kabel Cable 5306 20 Studs 16cm Technic Train City Light & Sound | eBay
1 x Lego Technic Electric Kabel schwarz 46 Noppen Anschluss Verbindung Verlängerung Eisenbahn Strom Elektrik ca. 35 cm geprüft Typ I 5306bc046 | Steinpalast EN
I restored my old, porous Lego Technic cables from the 90s. It went easier than I thought. A thin wire and a little skill with the soldering iron is enough : r/lego