On the supplied wiring kits, you connect like colors, except for the blue wire (the amp turn on lead wire) if your car doesn't have a factory amp. You do however connect the blue/white wire (The power antenna wire) since the Alero has an interior antenna integrated with the defroster lines. The orange wire is for the dimming feature. Your radio doesn't dim when the interior lighting gets turned on. That's why you don't have that wire on the radio side. Simply tape the end off so it won't make contact and pop a fuse.
I assume the amp only works on the rear speakers, but I'm not sure. I never had an amp in my old N body so I never dealt with that issue. Easiest way to know is to disconnect the amp and see what speakers don't work.
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2̶0̶0̶3̶ ̶P̶o̶n̶t̶i̶a̶c̶ ̶G̶r̶a̶n̶d̶ ̶A̶m̶
1994 Olds Cutlass Supreme
2̶0̶0̶2̶ ̶C̶h̶e̶v̶r̶o̶l̶e̶t̶ ̶C̶a̶m̶a̶r̶o̶
1996 Infiniti G20
1993 Chevrolet Lumina Z34
1989 Buick Regal Limited
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