Lucas was once called The Prince of Darkness. That was partially unfair. The company just didn't get enough budgets from its clients to make something good for it.
The copper worm also reappears in more recent classics. In those cars the austerity virus has ensured that especially (multi) plug connections remain a source of surprise.
In the event of a fault, first try to move the connector parts a little. that often gives a nice diagnosis. Multi-plug blocks and the accompanying pins and spikes are pretty standardized. So complete replacement is possible.
But laying a by-pass or repairing a faulty connector can in any case solve the technical aspect of the problem