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Since I've never seen the ammeter connection I can only surmise some facts from the schematic which may or may not apply in your case. One wire should be #8 gauge and eventually terminates at the starter solenoid relay. Another should be #10 gauge which parallels all the loads including the ignition and lights. I cannot find a reference for a third wire so I'm assuming it might handle illumination of the gauge itself. Note: Like most factory installed ammeters Fords use a shunt circuit to reduce the possibility of a fire in the gauge cluster.
Sorry there are no colors listed on the schematic I have currently. You'll have to do some circuit tracing to confirm all of the above. Success here depends on your knowledge of electrical principals, testing equipment (VOM), and your willingness to crawl all around the car to confirm everything.
Note: Never guess based on these descriptions, you can fry your electrical components or worse set the car on fire!
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