Subwoofer doesn't work. Thoughts?

[chrisnickman]

I own a 1988 Ford Bronco, and it came with a sub. For the first couple months, it worked great. Now, it cuts in and out while I am driving. I do take the Bronco off road a lot. I will be driving, and it doesn't work, and then randomly it starts playing. There was one time when i was driving with my friend and the music stopped completely, but the sub started making a loud thumping noise. Without the sub, my sound system is garbage. Please help! Thanks in advance.

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[giltyler]

Check your ground and power connections first.