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
Alte LEGO Sets aufbereiten: Anleitung für Reinigung und Reparatur
Lego® 9V RC TRAIN Railway Electric Cable Wire with Brick BLACK 10 CM | eBay
LEGO-Kabel reparieren: 9-Volt-Kabel in 4 Schritten wie neu
Attention LEGO 9V train users: Our friends at @atlbrickco are offering refurbished 9V train system wiring, replacing the rot-prone older… | Instagram
LEGO part 5306c01 - Dark Gray Electric, Train Track Contacts with Wire and 2 x 2 x 2/3 Brick at BrickScout
LEGO 5306 - 9V Kabel Wire - Auswahl alle Längen all lengths - 100% intakt - TOP | eBay