Won't start. Where can I get a wiring diagram?

YOU NEED EXPERT TEST EQUIPTMENT,,YOU NEED DEALER TECK HELP. TAKE IT OR TOW IT TO A DODGE DEALER

Could be your injector circuit is the problem. Check if injectors have power to them with key in on, not start. Each injector has a common hot wire and a ground that goes into the computer for internally grounding the injector circuit, and consequent pulsing of the injectors. There should also be an injector fuse, so check that if circuit has no power to the injectors.
At a parts store, you can buy a very cheap injector circuit tester called a "noid light". You just plug it into the injector connector and crank the engine over. If circuit is good, the noid light will be blinking. If no blinking light, either the power side or the ground side is the problem. If you have power to the injectors, it must be the ground side has a problem-common for wiring to get too close to a hot exhaust part and melt the wiring.

So, it's the injector circuit. There is a 10 amp injector fuse in the fuse block, on left side, 4th one down. Check this fuse. It supplies constant power to both injectors, on the red wire to injector 1, and a white wire splice from this to injector 2. A steady 12 volts anytime key is in on, run, or start. You can check this with a test light or voltmeter. Ground the test light and probe injector connector's red wire on injector 1, and the white wire on injector 2-both should be hot with key on.
This may be why the noid light didn't blink. The noid light must have this steady power signal, and when the computer internally grounds the injector ground circuit for a split second, you get injector pulse-or a blinking noid light.
You can check the ground circuit separately with a test light also for each injector. Place the ground clip of test light on the POSITIVE battery post, and probe the blue (ground) wire on injector 1, the engine must be cranking over, and the test light should be blinking. Do the same for the green wire on injector 2. If the test light is blinking on both ground wires, with engine cranking-the ground circuit is good. You are sending power down the ground wire to computer, and when the computer grounds the circuit, the tester will light up-it will blink because the computer only momentarily grounds the circuit to cause pulsing of the injectors.

camshaft sensor or crankshaft sensor. do you have any spark?

Guessing when you say pressure that you have fuel pressure and that the fuel pump is working but the injectors aren't pulsing and injecting fuel into the cylinders. The way your fuel system works is that you should have constant power at each injector and the vehicles computer (the ECM) gets readings from different sensors and send a quick ground pulse in order to complete the circuit. each time the ECM sends a ground pulse, that's when the injector injects fuel so the ground signal/pulse is quick (on and off, one and off..you get the idea). The first thing I would do if your fuel pump is pumping and you have fuel pressure is check the fuse. The fuse you want to check should be a 20 amp fuse in the fuse panel under the hood of the vehicle in the engine compartment. Below is a diagram of the fuse layout and I have marked the fuse you need to check (the ECM 1 fuse). If that fuse is blown you will not have that constant power at the injectors. If blown replace and that should solve the problem unless it blows again which would mean you have a short. If it isn't blown make sure you have power at all time when the key is on. The pink wire at each injector should be the power wire. If no power you need to locate the open wire for that circuit (coming from that fuse to each injector). This is where I would start. If you need further instructions as far as any more testing procedures, reply/comment here or feel free to email me directly at [email protected]. Hope it's as simple as a fuse for your sake and I hope this helped.

If you have spark, the computer is getting the signal to pulse the injectors.
If you have power but no ground pulse, you may have fried the driver in the computer again.
You could get a used computer from a junk yard to test it.
There could be a short in one of the injectors or the harness at the computer, or a break in the circuit from the computer, and that could kill the driver in the computer.

look for a bad ground, you can try running a new ground from the battery to the body, i had an 89 corsica that would not fire until i ran the new ground wire.

This truck will not run else you pour gas into throtle body.
Okay, you know its fuel, you are saying that the wires to battery were cut.

Before going into the wiring did you use a noid light to see if there is a pulse at injectors? or are you thinking its that due to the fuel not getting to engine?
I would make sure the fuelpump is operating and suppling enough fuel pressure and test the injectors for power and ground, a noid light would be a great cheap tool to test.

If you have already tested and there is no pluse then check the wiring but take note, check wiring to distributor as your pulse will come from that and the computer.

Look for any blown fuses or power wires that are missing. i will enclose a few wiring diagram that i think will help you in your testing . also here is the injector wiring diagram you requested for the 1992 nissan pick-up.

Have a good day and let me know if there is anything else you may need .

Have you tested out the fuel pump? check for plugged fuel filter?
plugged fuel lines to the fuel rail, injection pulse at the injectors? power to the fuel pump relay? grounds needed to make certain systems work must check those also. get a wiring diagram of the fuel supply system and back trace all the wiring and see if you have power and ground and signal.

i would check for any LOOSE OR MISSING GROUND WIRES that were originally bolted to either the bellhousing/starter bolts or if the wiring harness that runs over the tranny and connects to tranny switches has been cut/damaged. you would be suprised how many problems can occur because of bad/ missing grounds!!