Driver headlight dim, no throttle past idle,

[Sprout]

2005 Z71 Suburban, just replaced the transmission. No electrical issues before trans replace. Now I have the following, driver head light real dim, no throttle response past idle, when I turn off the ignition the motor still runs unless switch the key on off, negative battery cable has voltage when disconnected and when connected to negative side of battery. None of issue above existed before replacing the transmission.