Ok, you are wise to ask for the wiring scheme. It took more time to figure out the wiring than to install the unit. Some details: Truck is 2017 SR5 double cab with the NON JBL stock system. Stock harness are: J144 10 Pin, and J145 12 pin. Attached are pics of these harnesses. Amp is Alpine KTP-445U. Alpine Harnesses, There is an input side(gain side) and output side(fuse side) harness. Choose speaker level inputs, 4 channel. Will keep the stock HU, stock wiring, and stock speakers. We will cut the stock harnesses and wire to the Alpine harnesses. Power and grounds: What? Stock harness Alpine Harness ACC in J144 Pin #3 Sky blue In harness Remote In Blue white 12V in J144 Pin #4 Red Out harness Yellow Ground J144 Pin #7 White/Black Out Black Ground J144 Pin #9 Out Black Speaker level Inputs: Front Left + J145 Pin #1 Brown In White Front Right + J145 Pin #2 Pink In Gray Rear Left + J145 Pin #3 Light Green In Green Front Left - J145 Pin #6 Beige In White/Black Front Right - J145 Pin #7 Gray In Gray/Black Rear Left - J145 Pin #8 Black In Green/Black Rear Right + J145 Pin #9 Blue In Purple Reat Right - J145 Pin #10 White In Purple/Black Speaker Out: Front Right + J144 Pin #1 Light Green Out Gray Front Left + J144 Pin #2 Violet Out White Front Right - J144 Pin #5 Blue Out Gray/Black Font Left - J144 Pin #6 Pink Out White/Black Rear Right + J145 Pin #4 Red Out Violet Rear Left + J145 Pin #5 White Out Green Rear Right - J145 Pin #11 Violet Out Violet/Black Rear Left - J145 Pin #12 Green Out Green/Black