Will this start a fire?

Hey there, I have a concern about this! Maybe I am not interpreting what you have drawn the way it would be in reality, but there is a pretty big concern here!

You should NOT be pushing power from the "fuse only" circuits through the switches. Switches are designed to be on low amp circuits only. The after-market versions I have purchased and installed even come with a warning on the box that states that they WILL MELT if full power goes through the switch. What you want to do with a switch is to control the relay, and then the relay is just the on/off switch for the power that goes to whatever you are turning on and off.

The exception to this is where your controlled device has a very low amp draw.

A good use of the fuse-only circuit would be some power circuit that you do not need to switch on and off, such as power to a mobile two-way radio where you switch the radio on and off but want power to always be on.

UPDATE: I just realized you are likely just powering the backlight feature of the switch on the fuse-only circuit. That would be fine.

 

Fug it! If it don’t work I’ll bring the marshmallows.. Who’s got the chocolate and graham crackers?

 

Yes. It is just power to the switches (G wire). The R1 wire will go the relay

 

Your setup is fine. Everyone else is just getting confused on your diagram.

 

The bed switch harness in his diagram is just an extension harness that has 2 leads coming off to tap dash light power for his switch LEDs. It’s not his actual powered accessory.

 

It will work, but if it were me, I'd daisy chain them so there aren't so many wires in one wad:

IUUU
top of I and of each U connect to a switch.

 

I figured I was missing something so I threw in an edit. Apologies if I muddied the waters but the discussion is good so everyone can weigh in and OP can consider all angles.

 

Yeah. That was the best way I could describe it. At least you know what's going on. Haha

 

Idk but bring marshmallows just in case

 

It would be cleaner IMO to run one wire each from the bussmann to the first switch, then jump to adjacent switches as needed. This method is much cleaner, uses less wire, and is expandable in the future should you choose. Additionally it uses the same wire gauge throughout so it would be acceptable to double crimp one terminal (vs crimping five wires into one)

I essentially did the same thing for my power and illumination: