So these boxes are something to do with a delay circuit for the ESA (electronic spark advance?) and egr (exhaust gas recirculator). But what exactly do these boxes do? To put it bluntly, I need to know if they're important or not, because they are melting, and I cannot find replacements. I'd like to know the function they serve, because my dad's '83 D150 does not have these boxes. Strangely, the engine is truck is blue, mine is black. http://i55.photobucket.com/albums/g139/Dead-Reckon/1984 Dodge D150 Prospector/0803161324c.jpg http://i55.photobucket.com/albums/g139/Dead-Reckon/1984 Dodge D150 Prospector/0803161323.jpg You can see the goo puddling below, it was green before the rain hit it. Just got the truck, it's a great truck, but it needs a few things, as any 32 year old vehicle likely will. Don't ask about the other red wire, it's some mess the previous owner made by adding a Neon fuse / relay box and running the headlights, fog lights, and an air horn through it.