power issues

Hello everyone, So to kinda help more here's my explorer and the events that happened. I have a 94' Explorer Xlt With the 4.0 OHV. It's a solid front 4x4, Automatic with the sad A4LD, (Got like a 2.5" lift with 33"s and a remote start from previous owner *kinda shoty job*). But here recently...

I am stumped by an apparent ignition problem on my '94 Explorer XLT. There is power to the cigarette lighter and overhead lights but not the radio or instrument panel. Until I turn the ingnition - then there is no power at all. I changed out the ignition 2 weeks ago and everything seemed fine...

I am running 4 12s with a 1200w 2ch and my battery is draining really fast. The gauge drops and everything fades when it hits. It was,working just fine yesterday. Do I need to just get another batt or,should I buy a capaciter?