the spark plug cables go through base to magneto/coil assemblies.
Onan does not offer cables separate from magnetos. Fairly involved procedure to replace, as the engine and mount base must be removed from main base tray, belt and pulley guard removed to access magnetos.
Not difficult, but you have to have someway to lift engine, such as a engine hoist or several very fit friends!
In an emergency, you might be able to splice new sections of cable, but remember these cables carry several thousand volts when firing, so must be insulated very well.
