Is this a?
 

It this just a 12v bus bar on the square bodies?

It appears a previous owner ran a 12v + wire from this bus bar to the 7 pin trailer plug in the back of the truck? Ideas on why they did this?

They ran the red wire with the white fusible link in it. (yellow arrow).

Re: Is this a?
 

If the arrow is referencing that red wire at the top of the stack, that's not a fusible link. Those white cylindrical shaped objects are inline fuse holders. There's a common glass fuse inside.. As for the wire going to the 7 pin plug at the rear -- it's anybody's guess, but it could be to provide constant power source on a trailer..

Re: Is this a?
 

could have been hooked to a camper that usues 12v batterys, driving would help keep them charged....Dad had a popup camper that was wired in a similar fashion

Re: Is this a?
 

My error I thought those were fusible link wires.

Re: Is this a?
 

Thanks you, pretty much confirmed what I suspected. Just kinda strange...

Re: Is this a?
 

Pretty common for one pin on a 7 way RV connector to be constant power.

Re: Is this a?
 

Here's a link to a typical fusible link..

https://www.4statetrucks.com/air-ele...ent=Ad%20group

A fusible link is a wire made of a special alloy that melts in to when overheated.. The link is typically a gauge or two smaller than the wire it's protecting.

Re: Is this a?
 

The black wire toward the bottom that runs into the cylinder looks like a factory fusible link. The wire on the other side of the cylinder should be larger.

Re: Is this a?
 

Thank you, I DID NOT know that.