Amazon: deh-1900mp wwwon›Search›deh-1900mpFits Pioneer DEH-1900MP Aftermarket Stereo Radio Receiver Replacement PIONEER DEH-1900MP / DEH-2000MP Wiring Harness Plug. by Generic. DNF Pioneer Wiring Harness DEH-P4800MP DEH-P4900IB DEH-P5000UB - 100% Copper Wires! by DNF. $5 $ 5 25. FREE Shipping on eligible orders. 1 out of 5 stars 1. How to Wire a Pioneer DEH-1900MP | It Still Runs Attach an aftermarket wiring harness to the Pioneer DEH-1900MP by matching the colored wires from the wiring harness to the colored wires of the DEH-1900MP. Twist the bare wire ends of the corresponding wires together and wrap each connection with electrical tape. Step 2.