It came with no instructions and i need the wrirng diagram for the new pigtail that needs to be tied into the wiring...

Check out the link, videos and the images tab.

https://www.google.com/search?q=2006+Kia+Sedona+LX+alternator+wiring

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check out the video

https://www.google.com/search?q=2006+Land+Rover+Sport+so+I+can+hook+up+a+pigtail+for+trailer+lights

and also

https://www.google.com/search?q=2006+range+rover+sport+trailer+wiring+harness

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try the12volt.com, it's a car stereo site, they have wiring diagrams. Did the new stereo come with wiring diagrams?

the connector is the same on both the old harness and the new pigtail. As long as you orientate the connectors the same way you just match up the wires. let me try to explain it this way. If you hold the old connector so the part that holds the connector to the sensor is facing up. Hold the new connector exactly the same way. cut the left wire on both and connect the new connector wire to the old wiring harness. Then cut the center wire and connect them. then cut the right wire and connect. No wiring diagram needed.

One thing I will add is to stagger the new connections. Meaning do nut cut them at the place. Cut one wire then cut the next about an inch or so further and then cut the next about an inch or so further than that. This will prevent the new connections from potentially shorting to each other and will keep the harness from becoming really bulky with all the but connectors in the same location.

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

You buy a new stereo, it should come with instructions

How you tie it into your car-- is something else

There, you may need a factory wiring diagram & work
with two sets of wiring diagrams

Okay here we go, there are three wires from the map sensor, if you look at the sensor there are letters stamped on the plug area, theres an A,B,and C the wires start from the sensor as orange/blk to terminal A then lite green wire to terminal B and last is gray wire to terminal C . im not sure what wires your freind cut but there only one at computer for map sensor and thats the signal wire, all slots at computer are numbered the signal wire is light green and connects to slot #25. heres a diagram for all wires to computer you will need to locate the wire in order to connect them back, this is not hard find the open slots and check diagram for wire color, hope this helps, good luck.

1992 Saturn SL2 Car Stereo Radio Wiring Diagram
Car Radio Constant 12V+ Wire: Orange
Car Radio Ignition Switched 12V+ Wire: Yellow
Car Radio Ground Wire: Black
Car Stereo Illumination Wire: Gray
Car Stereo Dimmer Wire: Brown
Car Stereo Antenna Trigger Wire: N/A
Car Stereo Amplifier Trigger Wire: N/A
Front Speakers Size: 6 1/2′
Front Speakers Location: Doors
Left Front Speaker Wire (+): Tan
Left Front Speaker Wire (-): Gray
Right Front Speaker Wire (+): Light Green
Right Front Speaker Wire (-): Dark Green
Rear Speakers Size: 6 1/2′
Rear Speakers Location: Rear Deck
Left Rear Speaker Wire (+): Brown
Left Rear Speaker Wire (-): Yellow
Right Rear Speaker Wire (+): Dark Blue
Right Rear Speaker Wire (-): Light Blue

All you need to do is go to the parts store, and get a wiring kit for your vehicle. It will plug into the factory harness, and the colors on the new pigtail will be same as the aftermarket c/d player. Hope this helps.

GOOD LUCK