So I changed the stereo in my c240 n added an amp n subs. Within a few weeks I started having electrical issues throughout the car. I popped the cigarette lighter and the deck itself blanked out. Now the driver side headlight is out I swapped bulbs to a led with a fan $120 n it still doesn't stay on. The light flickers for a minute then shuts off n I literally pulled every fuse in all 3 boxes .right now I'm stealing power from my high beams to run my lights. What could possibly be the issue.

 

Sounds like you're using too much power for the sub and amps. Look at getting a capacitor.