2006 Dodge RAM Cummins 5.9L - Sketchy Wiring?

[87powerram]

Not sure if this is the right section, but I’m looking for some insight.

I’ve got a 06 Dodge RAM 3500 that I bought about a month ago airdog is blowing fuses, so while I was under the truck today checking it out, I decided to trace down some of the sketchy wirings.

1st relay is tied into the engine harness below the grid heater.

Engine side wires appear to be one red(butt connected to the added-in yellow wire) & 1 black(snipped off and not connected) & 1 heavier gauge wire connected directly to the negative d-side battery terminal.

A yellow wire ran back to almost the fuel tank, connected with spade terminals and taped up, and then ran back to the relay at d side battery.

The orange wire came off the relay and was run back to the fuel tank lying over the frame and cut.

Orange wire only has power when the yellow wire is connected.

2nd relay(all black wires) is getting its power from the first relay, which from what I can tell, is just powering the headlights, so they come on whenever the key is on (pic 5).

Also, there is a small black box on the fuel lines towards the rear of the engine, any idea what it is? (Pic 6-7).

Any help with what they spliced into and what the little black box is would be much appreciated!!

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