it is a diagram of the engine?
No.
The 1993 Jeep grand Cherokee brake light switch simply plugs in and out. The brake light switch is located beneath the dashboard on the drivers side of the engine compartment.
Dirty spark plugs can occur on any make, model, or year. Changing the spark plugs should be done for maintenance, such as when you do a tune up.
To change the spark plugs on a 2004 Jeep Grand Cherokee V6, first, ensure the engine is cool and disconnect the negative battery terminal. Remove the engine cover if present, then carefully unplug the ignition coils from the spark plugs. Use a spark plug socket and ratchet to remove the old plugs, then gap the new plugs according to specifications and install them, tightening to the recommended torque. Finally, reconnect the ignition coils and the battery terminal.
I have a 1993 Jeep GC Larado also. Recently I didn't have spark either. I replaced my coil: didn't fix the problem. Then I started to think that it might be as simple as a fuse. There is a fuse panel under the hood where all the ABS controls are, inside is a 20amp fuse that controls the ignition. Mine was blown, once I replaced it, the vehicle started perfectly.
bad plugs
Beneath their coils.
I own a 2006 3.7L grand Cherokee and my tune up consists of spark pug replacements (6) for me, differential fluid change, ATF fluid change (no flush), and PCV. If you have a transfer case you will need to change that as well. good luck!
The plugs are under the coil packs that are on the passanger side of the vehicle. This is of course if you have the 4.0 engine. I would need to know more about your vehicle to gie you the best answer.
Generally I change platinum plugs at 100K and regular plugs at 50K.
They are under the coils, next to the fuel injectors.