I have a 2000 accord and I have a 350 Alpine Amp along with a 10' JL sub.
Tweeter installed it.

But everytime I turn on the windshield wipers, the sub kinda fades and its not as loud.. Whats going on? Also its starting to like work sometimes and not work on others. Im thinking maybe its the battery, since ive got 90,000 on the car and havent changed the battery yet..

What do you think could be wrong?