Well the capacitor between the negative and positive lines in the terminal block was broken. we couldn't find another 100v so we put in a 50v. we also found that the battery closest to the grill didn't have the ground wire on it so we put that back on. we also replaced some fuses but other than that we didn't change anything. when we replaced some fusses it fired up but the alternator is still sparking. it starts slow but she still fires up. once we get the alternators fixed she'll be a beaut again.
The suppressor between the Neg and Pos terminal block is used for noise reduction for the 24v Military Radio Systems. It is not needed for everyday use. I have seen many that have shorted out and where removed.
The front battery is tied to the driver side alternator and supplies the 12v that the majority of the CUCV electrical systems use.
The rear battery is tied together with the front in series to supply 24v to the starter, glow plug system and military radios. It is charged by the passenger alternator.
The missing ground wire for the front battery. Was it the small wire or the 2 gauge heavy wire?
The fuse box is an issue with almost everyones truck. With the trucks being 25+ years old and the hard/harse life they have had, they are dirty and corroded. When you have time, disconnect you batteries, remove the fuses and clean the fuse box with some electrical contact cleaner and some sand paper if needed.
With the description of your issues, I would say that the previous owner had issues and changed some of the electrical wiring. So the question is do you want a stock wired truck or a modified wired truck?
If you want a stock truck, you will need to download the tech manuals, read the first few pages of the troubleshooting section that explains how to read the wiring diagrams, print off the wiring diagrams from the appendix and start checking to make sure the previous owner didn't modify the system. Without knowing that the system is wired correctly, it will be difficult to begin troubleshooting.
That being said it isn't that hard, just time consuming.
Do you remember which fuses you replaced? It is possible that when you replaced a fuse, you energised a "modified" circuit.