I don't know if this was just a coincidence, but my glow plug light came on for a couple of seconds about 3 minutes after I started driving the car from a cold start, then I heard a screeching sound from the engine. The screeching was temporary. It sounded like a belt, so I checked to see if coolant had leaked from the cooling system 5 minutes later when I got home. The alternator belt felt very dry, maybe I should change it soon, since I don't know how long it's been on there. Is it possible that I'm having alternator issues that are affecting the glow plug relay, or light?
Also, I have an afterglow relay and glow plug wires in my garage that I've been meaning to put into this car. I've already upgraded to pencil type glow plugs by removing the ground wire from the first glow plug. Does anyone know the wiring involved to complete the upgrade? Thanks

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'81 300SD