1988 Cadillac Deville, Stereo Wiring

I am trying to put an aftermarket stereo in a 1988 Cadillac deville sedan. The factory wiring has 4 plugs. I know what the 3 are for on the drivers side of the stereo ( 1 for the front speakers, 1 for the rear speakers, one for power etc.). There is a plug on the passenger side with an orange wire, a grey and grey/white wire and 2 orange/white wires. What are these 3 wires for.Brent railton

If your factory plugs are still intact, your best bet is to use a wiring harness adapter. You can pick these up cheap at Walmart or your local auto parts store. eBay and Amazon are typically cheaper. Car stereo shops will have them but charge more. Orange is likely the constant wire, not sure about the others. Have a look here: https://www.installdr.com/QuickWiring.asp