SX455

I JUST PURCHASED A AM RADIO FOR A 70 442. I WAS TOLD IT WORKS ?? I DID A BENCH TEST ON IT, ONLY THE LIGHT LIT INSIDE, I RAN POWER TO THE BACK WHERE IT SAYS 12 V. THE BLUE WIRE COMING OUT THE PLUG IN BACK OF THE RADIO WENT TO THE SPKER AND THE BLACK WIRE TO GROUND AND THE SPKER,I HAVE NO SOUND . IS THIS THE PROPER WAY TO HOOK UP A OLDS RADIO , I HEARD THEY HAVE A DIFFERENT HOOK UP THANKS FOR ANY HELP

SX455

I PUT A ALIGATOR CLIP IN IT WITH A WIRE ATTACHED, I DID NOT HEAR ANYTHING BUT A LITTLE STATIC WHEN TURNING ON AND OFF ALSO TRIED TO TUNE THE STATIONS