What does it mean when my pioneer car stereo keeps saying source off

SOURCE: Pioneer Car Stereo blows fuses

You have a short on the right side of the vehicle, you mention a fuse to the right channel speaker keeps blowing which tells me that either the speaker is blown or the wire running to it from the deck is touching metal somewhere. Check the wiring, or install a different speaker and see if it takes care of the problem. When you turn right the system goes off then back on tells me that there's a short. Check all of your stereo related wiring.

SOURCE: pioneer DEH-P3100UB car stereo keeps turning off and on again

broken wire, or dirty connection....oh check your ground wire for radio...