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If your amp has high level inputs, you won't need a line level RCA output converter. Some amps do and some amps only have RCA inputs. If the amp has them, the high level inputs will be a four pin connector with:
White Left +
White/black Left -
Gray Right +
Gray/black Right -
You can run wires from the speaker wiring to the amp's high level input wires.
2000 F150 Audio wiring colors:
Left Rear (+) Orange/Light Green
Left Rear (-) Light Blue/White
Right Rear (+) Orange/Red
Right Rear (-) Brown/Pink
We used to make a speaker "popper" to verify polarity of unknown speaker wiring.
Using a C or D cell battery, connect the speaker wires to the positive and negative of the battery. If the speaker moves outward the wire connected to the positive of the battery is speaker +, if the speaker moves inward, the wires are reversed polarity.
This is helpful to get both left and right speakers into "phase". Both sides will be pushing outward at the same time when audio signal is applied. If one speaker is wired opposite of the other, they will be "out of phase". Out of phase speakers will have great bass only when all left or all right is selected on the balance control.
My head unit in the F250, has single CD, USB, aux for ipod type personal players and HD for High Definition broadcast radio stations. I use the rear P-Bus connection for XM satellite radio. Comes with remote that can change all audio levels, not just volume, mute and source or on/off.
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