86 FLC120 engine brake

I’ve got a 86 FLC120 with a 400 Cummins that I’m trying to get the engine brake working. I’m assuming the person before me didn’t care for it and looks like they cut 2 of the wires. The wires are cut right at the 4 wire plug (if that makes any sense) on the side that goes to the engine. Does anyone know of how it should be wired or have any diagrams to go by?

 

Here’s a picture of the cut wires. Ignore the oil she’s old

 

Not sure what to put for engine info. In the glove box all it says is F-400 400 hp at 1900 rpm

 

After looking at it it looks like the wires went to the throttle sensor because it’s completely gone

 

It is a C-Brake. Or at least the switch for it says Cummins brake. The switch on the fuel pump is completely missing. I’m assuming that’s where the cut wires went. What do you mean about you may have some surprises when you turn them on?

 

Here’s the switch. I’ll get a picture of the fuel pump in the morning because I’m positive the throttle switch is gone. As well as the arm that hits the switch

 

I’ve tried and still nothing. Is there a fuse somewhere I could check?