dc-dcc connection and power hookups

[kevin2083]

I was wondering- when connecting the bachmann dc controller to the E-Z command center, can both 16V power packs be connected to boost power and still be 16V, or will this just create a 32V decoder-melting motor-burning vortex of doom? Also, can the black connnector wire be made longer? I'm sure it can- but how many wires are in it? it looks like three judging by the end connectors.

thanks