What is plug 1 on a 1993 Jeep Cherokee 6 cylinder?

There's no single "plug 1" designation universally applicable to all 1993 Jeep Cherokee 6-cylinder engines. The firing order and therefore the cylinder numbering varies slightly depending on the specific engine (4.0L inline-6 is the most common, but there might have been others).

To find out which cylinder is #1, you need to consult your owner's manual or a repair manual specific to your Jeep Cherokee's engine. These manuals will show a diagram of the engine, clearly labeling the cylinders and their corresponding spark plug wires. The firing order will be listed, allowing you to trace the #1 spark plug wire to its cylinder.

Without that information, any answer would be a guess and potentially lead to incorrect maintenance.