96' Intrepid Electrical Problems w. my upgrades

[1QuikIntrepid]

i have infinity Door Speakers and Loud Speakers in the back. Installed by Circuit City. No Problems with that equipment. about a year and a half later i had Car Tunes Install a JL Audio Amp and two 12 in. Subs. I did not notice any problems with the electrical. But when i would use the car lighter the fuse would blow everytime. That is my first question, my second is when i have a new fuse and i havent pushed the lighter in causing it to blow. The Radio will go in and out. Im not sure if it could be a loose wire in the back of the head unit for the radio thats jiggling around or what.

I also have stock battery/ alternator.

Any help of suggestions would help thanks guys!

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