Passenger side speakers wont work.

[2.SlowES]

Hey there!

So today as I drove to my grandmother's for mother's day, all the speakers on the right side of the car went fuzzy and then shut off completely. They started working and then shut off once again a couple times before I had reached my grandma's.
Any ideas on what could be going on? My multi-meter is at school at the moment so I haven't had the chance to start hunting the problem down.
All my stereo equipment is less than a year old, and I'm not running the speakers through an amp.

Thanks in advance!