[Two Yeets]

I keep seeing questions emerge about fuse box locations, as both the gasoline and diesel variants have multiple spots that hide in plain sight, kind of blending in with all the other components to an untrained eye. So here are the fuse box locations for both gasoline and diesel Titan XD's, taken from the owner's manual.

The VK56VD (gasoline engine) has 2 boxes adjacent to one another on the right side of the engine bay near the firewall, and another on the left side towards the radiator.

The ISV 5.0 Cummins (diesel engine) has one box behind the coolant resevoir, and another to the right of the resevoir.

The last fuse box resides next to the glove box. You can access it by opening the gove box, then removing a panel to the right. There is no emgine label, so I believe both gasoline and diesel trucks have this.

There are two sizes of fuse found in our trucks: mini and low profile mini. Both sizes can be found in the engine bay boxes, but only low profile mini will be found in the interior box by the glove box.

Unfortunatley, the owner's mamual doesn't seem to show us the fuse box layouts and which circuit each fuse or relay switch services. The service manual isn't any help either, but it's often hard to navigate so I'm still trying amd will update this post if I find something. In the meantime, just look on the back of the fuse box cover for the layout. I will also come back to add the relay switch sizes once I find those. I'm out of state and away from the truck, so I'm restricted to the internet for my answers.

 

[AlanJ]

Unfortunatley, the owner's mamual doesn't seem to show us the fuse box layouts and which circuit each fuse or relay switch services. The service manual isn't any help either,

It does but it's a bit convoluted. If you look in the PG manual, it shows the various fuse blocks and the fuses/numbers within.

So that's the fuse block called 'JB' and it happens to be the one on the passenger side up by the firewall. Then if you look at a wiring diagram which is in each relevant section, you'll see both the fuse block and the fuse listed. Here's a snapshot from the EL Exterior Lighting showing the fuse location for the headlights.

It took me a good while to figure this out but once you know where to look, it's not too bad.

 

[realbored]

Unfortunatley, the owner's mamual doesn't seem to show us the fuse box layouts and which circuit each fuse or relay switch services. The service manual isn't any help either,

It does but it's a bit convoluted. If you look in the PG manual, it shows the various fuse blocks and the fuses/numbers within.
View attachment 48239

So that's the fuse block called 'JB' and it happens to be the one on the passenger side up by the firewall. Then if you look at a wiring diagram which is in each relevant section, you'll see both the fuse block and the fuse listed. Here's a snapshot from the EL Exterior Lighting showing the fuse location for the headlights.

View attachment 48240


It took me a good while to figure this out but once you know where to look, it's not too bad.

Unfortunately the HTML wiring diagrams in the service manual are not the easiest to navigate as you have noticed. The actual manual used in the shop has Electronic Wiring Diagrams which are far more user friendly. Click on a wire, connector or component and it highlights the entire circuit making it easy to see which fuses are used. Also on the side panel it has hyperlinks to the fuse box location and other information.