Battery or Altinator or ????

ok i have been running my sub and amp setup for a good 8 months or so and it has never given me any problems. Until now for some reason my amp isnt getting enough power any more to run and it shuts off. My car still starts fine and i have no problems running with out the stereo. So my question is do you think this is my battery or my altinator or something that i have absolutly no idea about lol thanks any help is appreciated.

How do you know it doesn’t have enough power, did you check the voltage?

well my amp has a voltage meter on it and it tells me how much juice its getting but i figured out the problem i over looked one thing and it was stupid of me my amps ground and it was my problem but thanks anyway