1994 Isuzu Trooper Car Stereo Wiring Schematic Whether your an expert Isuzu Trooper mobile electronics installer, Isuzu Trooper fanatic, or a novice Isuzu Trooper enthusiast with a 1994 Isuzu Trooper, a car stereo wiring diagram can save yourself a lot of time. Automotive wiring in a 1994 Isuzu Trooper vehicles are becoming increasing more difficult to identify due to the installation of more advanced factory oem electronics. 1994 Isuzu Trooper OE Wiring Harnesses & Stereo Adapters Isuzu Trooper 1994, Aftermarket Radio Wiring Harness by Metra®, with OEM Plug. For aftermarket stereo. Metra preassembled wiring harnesses can make your car stereo installation seamless, or at least a lot simpler.