Locking and Radio stopped working
 

Okay so my aftermarket radio was going in and out. Like it would randomly just stop playing music, then come back on. Still had power, just sound output would stop. So I took out the radio to make sure all the wires were solid and fine. Put it back in. Now the radio won't turn on and the central locking stopped working. I'm at a loss.

fuse 5!?

ol' 740 would blow fuse 5 and radio would fail and seatbelt chime would stay on!!!! terrible.

DMM?