I just installed a amp/sub in my gsr.

I turned the ignition to "on" and the sub powered up just fine. But when i tried to turn the engine on, the electricity to the car just died. no headlights, accessories, etc. I pulled the amp fuse and the car started working again. So I double checked the wires, put the fuse back in, and try it again. The same thing happened only this time the car stays dead.

Any ideas? Ive installed subs before on my maxima and that went without a hitch so I dont think it is because I am forgetting something. I am wondering if my car's factory security alarm might be interfering with it somehow? Ive never bothered messing with it so I have no clue how the previous owner had it setup. He also had a amp/sub installed. I can tell because the wires were cut. All I did was run new wires to the head unit.

 

nevermind i got it working... battery terminal was corroded just enough that the car would die when trying to start it. weird