If the truck's wiring hasn't been cut, you can buy an adapter plug.
Do you have a wing schematic for the deck?
Do you have a haynes manual with a wiring schematic?
Do you have a test light or meter?
If you connect the deck incorrectly, you may blow/ruin it.
Many decks need two power sources in order to work, one for the memory, and one to turn the deck on.
What color wires does the deck have?
What color wires in the truck are you trying to use?
Does the truck have a power antenna?
If your truck's wiring hasn't been cut, the folowing link may provide help in determinig the different pins with the stock plug.
http://personal.utulsa.edu/~nathan-b...11audiosys.pdf