So I had my glow plug controller stick and cook my plugs. I installed AC Delco 60G plugs on a manual switch. I recently got the truck starting better and wanted remote start. This is how I solved my issue of a bad controller. This could be used to replace your controller without remote start as well, it's basically a solid state controller. It's a pretty simple project and good starter project if you don't have circuit experience. Let me know why questions you have, it does work, I just installed my remote start today.
Circuit for glowplug control with a remote start when your truck is setup with a manual switch. - YouTube
Circuit for glowplug control with a remote start when your truck is setup with a manual switch. - YouTube