Cab Module?

[DVT873]

Two things. There are Mega fuses, usually on a panel off the engine side of the firewall on the drivers side. Those lose connection and/or corrode more often than they blow. In the battery box you may have "cube" fuses. If you have never seen them you probably wouldn't know they were there. They get covered with anticorrosion gunk when new and look like a black or red blob. https://www.google.com/search?q=cube+fus...e&ie=UTF-8

If it's not there you need a diagram. Pick something thats not on and work your way back to the batts. NAV does use the post on the starter solenoid as a junction point. Three or four feed wires are connected there. They are fusible links. The nut gets loose but that usually an intermittant problem. Fusible link is like a fuse but if it "blows" you can't see it, the wire insulation is special and is meant to contain the heat. It usually doesn't melt thru so you don't see the failure.

A link to NAV's public site for wiring info. https://www.internationaltrucks.com/body...-resources