Need photos of alternator and starter wiring on 93 nissan 4wd - 4 cylinder truck yes please i disconnected and didnt label wires thought it would be faster it wasnt. its good lesson. the engine compartment is very tight and i cant see where the ground/positive? wires attach.

Does your battery have a large spark when you connect or disconnect it? A small spark may appear. A large spark would be a large drain.
There should be a wire from the starter or a junction block that goes to the plug on the alternator. It is a voltage sensing wire. It is also a fusible link. If the wire is not melted away (thats how they work as a fuse) it may be corroded inside the white (or black) plastic connector.
Remove the plug from the alternator and check the larger wire on it for 12 volts.
The other end of the wire will go to either the starter or a junction block on the firewall or near the battery.
Look for these
Don't just look at them, give a little tug to see if they pull out of the bu-tt connector

And you can go to Autozone.com and they have free wire diagrams in the repair section.

The firing order and spark plug wiring layout is depicted in over-the-counter repair manuals like the Haynes for '87-93 Ford Mustangs. If you can't spend the ~$20 on one of those (available at Pep Boys, Autozone, eBay, Amazon, etc) you should be able to check one out from your local library.

i believe it goes to the alternator

Starter - 4 Cylinder

1. Release hood latch and open hood.
2. Disconnect and isolate the battery negative cable.
3. Remove the air cleaner box.
4. Remove the lower bolt.
5. Remove the upper bolt and ground wire

Starter Removal - 4 Cylinder

1. Remove starter.
2. Disconnect solenoid wire connector from terminal
3. Remove nut holding B+ wire to terminal.
4. Disconnect solenoid and B+ wires from starter terminals.

For the 1993 Nissan Altima 2.4L DOHC in-Line 4-Cylinder:

Firing Order:
1 - 3 - 4 - 2
Cylinders:
_____back______
|...1....2....3....4...|
_____front_______

Distributor:
3.........1
......o.....
4.........2

For the 2.4L (Z24) SOHC:

Firing Order:
1-3-4-2

Cylinders
P__
u|.|.| Intake Side
l |.|.|....1....2.....3....4......|
l |.|.| Exhaust Side
e
y

Distributor:
.....1.....2
3................4
4................3
.....2.....1
Rotation:
Counterclockwise

disconnect the battery first then pull the wiring connection off ,then unbolt it ,

Don't know what size motor you have because you didn't post it so please pick the proper one:

This is for the 4 cylinder motor--


4-cylinder engine starter connections

1. Disconnect the negative battery cable.
   
2. Raise and safely support the vehicle on jackstands.
   
3. If equipped, it may be necessary to disconnect and remove the EGR pipe to access all the starter bolts.
   
4. Tag and disconnect the starter battery and control wiring at the starter.
   
5. If equipped, remove the starter bracket and/or heat shield.
   
6. Remove the starter-to-engine bolts.
   
7. Move the starter away from the engine and down to remove from the vehicle. Some starter may be installed with shims between the starter and engine. When the starter is removed, these shims may fall out. Do not loose them.
   

To install:

1. Install the starter and shims, if equipped to the engine. Align the mounting bolt holes and insert the bolts. Hand-tighten the bolts.
   
2. Tighten the starter mounting bolts to 30–34 ft. lbs. (39–44 Nm).
   
3. Install the starter bracket and/or heat shield, if equipped.
   
4. Connect the battery and starter control electrical wires to the starter.
   
5. If the EGR pipe was removed, install it.
   
6. Lower the vehicle.
   
7. Connect the negative battery cable.
   
8. Start the vehicle to make sure the starter functions correctly.
   

This is for the V6 motor--


6-cylinder engine starter installation

1. Disconnect the negative battery cable.
   
2. Raise and safely support the vehicle on jackstands.
   
3. Label and disconnect the battery and starter control wires from the starter.
   
4. If equipped, remove the starter bracket and/or heat shield.
   
5. Remove the starter-to-engine mounting bolts.
   
6. Lower the starter from the engine. If any shims are present, keep them for reinstallation purposes.
   

To install:

1. Install the starter and shims, if equipped, to the engine. Tighten the mounting bolts to 30–34 ft. lbs. (39–44 Nm).
   
2. Install the starter bracket and/or heat shield, if equipped.
   
3. Reconnect the electrical connectors to the starter.
   
4. Lower the vehicle.
   
5. Connect the negative battery cable.
   
6. Start the vehicle to make sure the starter functions correctly.
   

i have a 93 dakota....had problems with the starter.... thought bad wire, check out the wireing......ac and blower didnt work, and the acc.....check the black box where the key turns on....it control lot of things.....

According to the manual, it's pretty straightforward. Disconnect the ground cable from the battery. Then remove all wires connected to the starter/solenoid -- one heavy wire from the battery, and one or two smaller wires. Then remove the bolts which attach the starter to the engine. The starter is at the right side of the engine at the rear.

Installation is the reverse of the above. Make sure you have all wires attached and tight before you reconnect the battery ground cable.