Question about Infinity 475A Car Audio Amplifier
I assume you used the correct Metra plug (70-1878) to install the radio. Ensure the blue and white wire on the Metra is attached to the blue and white wire (or solid blue) on the Sony. This will provide + turn on voltage to the factory amp.
The other good possibility is that the Metra harness has a black and a black and white set of wires both must be ground.
Lastly the Metra harness does not provide these( -) grounds, they are supplied by the braided strap . or the single wire that was attached to the back of the Jeep radio.
Posted on Jul 22, 2008
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Posted on Jan 02, 2017
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