i have a 99 deville with the stock am/fm cassette ,i bought a stock 99 am/fm cass. CD player --it installs in the dash real easy -- just had to rotate the electrical plug 180 degrees-- had my local caddy dealer unlock the theft code ( he programed it with my vin # ) radio comes on but has no volume because it is searching for an external amp. ( stock cass. player has a built in amp ) is there any chance that the wire harness in the trunk will have the plug for an amp. hook up ? i thought about going to a salvage yard -- finding a 99 deville with the am/fm cass, CD and locate the amp in the trunk look at the connection and then look in my trunk to see if i have the same connection but not being used . what do you think ,any such luck ?