Where is the fuse

2006 Volvo 670. Where is the fuse located for 5th wheel air bags and diff lock. None of them are working. And it’s not labeled on panel

 

I’ll tell you up front I don’t know anything about Volvo. But most trucks operate those items with air. And your problem would be a valve mounted on your secondary air tank that operates these accessories which is probably stuck.

But Volvo could be different.

 

I think it’s electrical. Because the indicator light isn’t showing it has been selected

 

The light usually lights up when i press it and i get a message on the dash that tells me as well

 

F16 is diff lock fuse
F23 is air suspension

F01-F40 fuses are in the front facing fuse panel F40 and up are in top fuse panel.

as far as the web reckons

 

Did you find the problem? I got same problem on my 2014 Volvo vnl670