1965 C337 "Alternator not charging" light

[cessnadriver]

Hey Doc. My serial number is 337-200. A 1965 model. You know that when I was looking to buy this airplane, I did the PRE-BUY, I'm an A&P. I noticed the wiring from the regulators, looks like lamp cord. Insulators around the wires where all cracked. Last year I had a diode problem that took about three weeks to track down. I was thinking of installing Zeftronics regulators and possibly an updated alternator sensor that is installed on the 1968 models and beyond? I have a C337 parts bird, but it's a 1965 as well. Any suggestions in reference to the alternators going off line? Many thanks-in advance!
BILLS