mach 460 amp harness
This is an old thread so hope you're getting responses in your mailbox. Did you make sure to use the harness that was plugged into the original receiver. Some professional installers do use that harness which hits the amps.
If you had the stereo professionally installed somewhere and they opted to use the other harness which comes standard on all Fords with and without 460 then it would bypass the amps. This harness is usually attached to the right wall when not in use ( i.e. in models with Mach 460 ).
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