Ford Repair Questions? Ask a Mechanic for Answers ASAP
Welcome, I'm Chris (aka Moose) I'm an independent contractor here at Just Answer.
OEM does not use RCA jacks, so try the RCA's in the back of the radio first.
Can I get the year, make, and model?
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You use both jacks red and white, that is left and right, if your wanting to send a signal to a left and right speaker. If you are using the OEM amp and sub woofer there is a good chance the signal your radio sends out will not be compatible with the signal the OEM parts requires.
Below is a link showing the connector at the radio for the only wires going from the radio to the amp.