I have a late 1986 cucv with an ac delco 212-367 glowplug relay and I am having a heck of a time finding a replacement for it. So what I am wanting to do is convert it over to the earlier type relay that is like the solenoid off a starter. But what i am running into is the plug for mine that has four wires run into it. How do I rewire it to work with the old style relay. If anyone can help me out or maybe even have a wiring diagram that would help a lot.