I have been investigating why my 5amp radio fuse keeps blowing in my 1996 Taurus. I have researched and it runs both the radio head/air con controls and speedometer which are both not working. I have disconnected the radio head and the fuse still blows. I have even removed the interior fuse box and checked all the connections - there is no evidence of any issue. I have however found this relay near the amp in the trunk which appears corroded and even rubbed through. Any idea of this is on the same circuit and what the purpose of it is?