I see some things that make me question what you have done here.
First, I don't see the white from the fender mounted solenoid down to the starter mounted solenoid.
Second, where that wire is supposed to be, you have a large wire running off to this other solenoid mounted down below it.
You should have a heavy gauge 8 gauge wire from the positive power lug over to the fender mounted solenoid. From there, on that same terminal of the solenoid, other wires go off to keep constant power to the trucks main fuse box, and to the glow plug solenoid.
The glow plug solenoid you have rigged in here doesn't appear to have power all the time, and I don't see the fusible links that should be on the solenoid lug that goes off to the main fuse box of the truck.
It would appear you have quite a mess on your hands that is going to take some work to figure out.