Hello - Outfit Boss, gave you some good advice. I know it takes a while to search through all those threads but there is a PDF doc somewhere that talks about the diode failure in the glow plug controller. Here is a simpler solution. Go to a dealership that sells and services Thermo King Refrigeration Units or sells Isuzu Generator sets with your controller in hand and match one up. You may have to swap out connectors for a plug and play connection but as you indicated in your first post they are really all about the same as long as you match the cylinder numbers.