Bad Connection, Bad altenator,

ok I have seen this topic discussed a few times but no definate answer,......here is my problem

I notice a couple of months ago that my center console would shut off. Now what I notice is this

If my center console is "acting up" and I turn the key " not starting the car" but turning the key enough that the radio and AC and clock should turn on "they don't" but the rest of the electronic compnets work fine...now I assume that my battery should kick in at this point, since the car is not started can I assume that this problem is not my altenator?

I beleive this problem could be a bad ground, because this seem to start happening after I had an aftermarket radio put in. also one more thing

if I turn the car on and the center console is working ie "AC and clock" once I turn the radio on everything starts to mess up.....even if I turn the ac off the radio still fails to function properly...