stero in 2008 ram
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I had a 2007 ram now got a 2008 meg cab try to use harness I made for 2007 for after market stereo which fine but new truck I get no sound put back stock radio works ok ,truck has no amp .help ??/
Now if your 2008 has the infinity system this is when I would expect to see this problem....
Other causes are if your ground or 12V+ Ignition wires don't have a good connection.
You said you didn't have an amp, so I am guessing that means you don't have the infinity system, but if you have 7 speakers in there you definitely have the infinity system and you'll need the amp integration harness/CAN BUS Adapter.