NOTES:

(a) The 5-wire system was used in later locomotives in order to continue to provide power to the light and smoke unit while the engine sat in neutral.

(b) Later five-digit engines which had the two-position reverse unit mounted in the cab on the back of the motor used a two-pin plastic plug to connect the engine to the tender. In most of these engines, the chassis and drawbar are "hot". As a result, it is essential that the two-pin plug be wired as shown. If the two wires are swapped, a short will result when powered on the track, and you may damage the engine. To swap the green and black wires, simply pull the two brass pins straight out of the plastic plug using pliers. Swap the stripped wires, and tap the two pins back into the plug. They should crimp tightly against the stripped wires within the plug.

PART II: SPECIFIC ENGINE WIRING DIAGRAMS---
(click image below to enlarge)