spark

I was running a test tone and put my DMM AND as soon as the test leads made contact to the speaker outputs it’s sparked and my amp switched into protect mode for 10 seconds thoughts? Is it safe?

I have an aftermarket radio and amp in my truck. Everything was working fine but I had to move my power cord that went to my amp. When I did it touched my truck. It sparked. It blew the fuse in the cord and I replaced it. Bit now my radio won't work. It come on and lights up but no sound comes...