I didn't know you could purchase the connectors separatly. Thanks for the tip. It is the metal connectors (resistor tip ends) that seem to be corroded/damaged. As the rubber housing (above the connector) is cracked as well, I'll replace the entire set - wires and connectors. Besides, I think these are the original wires - 14 years old and they are probably due for renewal.
I'll see if that helps. If not, I plan to look at Fuel next.
Thanks once again.
190E 2.3, 1988