I'm running a Biketronics system, Kenwood head unit, 4180 amp and Biketronics speakers. The fuse on the power cable to the amp blew. After replacing the fuse I have a constant buzzing sound coming through my speakers that seems to go along with the motor.

I've checked the ground and everything seems good there. Any suggestions on what I should check next?

 

I would check and recheck that ground again. Check for loose or corroded connections. After that, check the shielding on the wires. After that check for a nicked our broken RCA. My guess is a bad ground or RCA. Happy hunting!
-FW

 

Couple of questions.
What year and model bike?
Did you determine what caused the fuse to blow?
What model Kenwood head unit?
Is the amp grounded directly to the battery?
How many speakers are there connected to the amp and do they all make the same buzzing sound?