visor lights wont come on

[DVT873]

Post the VIN aka serial number. If this is a 9000 series there is no body computer. There is a relay and a fuse on that circuit somewhere. Look for a blown fuse. This is a public link to my best guess on your wiring diagrams.

https://www.internationaltrucks.com/-/me...DF080F13C6

You may have to cut and paste the link. IIRC the relays and fuses are behind the dash panel on the passenger side on a 9000 series. I don't see a lot of those.