Ford E450 chassis Electric Trouble

The coach is a 2007 model with the chassis being 2006. I've inspected the five fusable links shown in the diagram. The two yellow 12 guage links that feed the fuel pump and blower motor relays and the battery junction box look brand new and there is no voltage drop between the battery and the junction box. One of the grey ones that are between the battery and generator has the insulation melted but again there is no voltage drop. I also checked both circuits with an Ohm meter and there was no resistance. I'm not an electrician by any means but this seemed normal. Is it possible that even though I'm not seeing any loss of voltage or reading any resistance that these fusable links may be the cause of my problem? I had asumed that since the system seems normal to the junction box, the problem is either in the wiring or fuses after that point or each component that has no power is actually dead. Either way it sounds like a lot of wire by wire testing.