WM 75: Chasing the regulators

Time to trace the electrical wiring going to the auxiliary generators, to see how they interconnect with the voltage regulators.  These machines are under the cab floor (whose panels lift up) and they rest on the engine room floor.   That floor is covered with oil, grease and grime from - guess where - the leaky engines and fuel drains.  All of the fuel drains are designed with a place to put a cup under them, but no one does - contributing to a disgusting mess for anyone who has to work in those spaces.

Anyway, here is the original wiring diagram, for generator #1, straight from the schematic.  X1 is the regulator, A1 is the aux gen contactor, and RC1 detected reverse current.

Oh wait, there's more.  Notice how RC1 and A1 are interlocked through the engine start contactors.

Remember I said a lot of the regulator system had been ripped out of the locomotive before we got it.  Now, after a lot of cleanup and chasing wire connections, I was able to discover that this is the schematic of the unit as actually installed.   X1 is the regulator, now an EMD type.  The rest is gone. 

Wow, a lot simpler, huh.