dont sound like you;re checking it right. if the noid light is "on" at the inj., but not flashing when you turn the motor over then you've got a short. it should be flashing. you need to check those 2 wires and make sure they are not shorted to groud. the computer is the ground for the inj. so both of those wires should be open until the computer. grounds them. the inj. could be shorting out all so. take the ohms meter and unplug the plug at the computer and at the inj. put the - meter lead to ground and the + to # 14 and # 16 pins and see if either wire is shorted to ground. should be open. dont cut the key on. check the ohms across the inj. also should be over 1.3 ohms. if the truck is running now its no need to check it its gonna check ok.