My interior lights are not working, including gauge cluster and gear lights. Also the cigarette lighter plug is inop. and when i hooked up the new stereo system the head unit will not turn on. I have checked the fuses and they are all good. There doesn't seem to be any burnt or cut wires. What else could it be.

Fuse 4 does the cigarette light and the side mirrors. Do the mirrors work?
4 15A Cigarette lighter and control system for side mirrors


Fuse 6 does tail lights
6 15A Stop lights
Fuse 14 does the Dash Lights
14 10A Interior lighting and luggage. compartments, clock, radio or radio tape recorder, instrument cluster, central door lock control unit, engine control unit, automatic transmission control unit
If all those fuses are okay, you need a good auto-electrician.

https://fuseandrelay.com/mitsubishi/mirage.html

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Check The Interior Fuse Box For A Blown Fuse for cig lighter possibly connections to sensors on motor etc ,!!
Also Might Be Cluster Issues is There Any other lights on?
Is It A Short in wiring? Ground issues again cluster connection? please give more info!!
We Are Here to Help !!

make sure your battery cables are clean also your battery post

sounds like you have a bad ground. could be the printed circut on the back of the cluster. as for the cig lighter def stsrt with a new ground

I had this problem on my '03 Yukon. There is an IC or other component on the dash/gauge panel that went bad, but I pulled the gauge cluster and sent it to mrwhizard.com. They replaced some parts, and i paid to have the stepper motors replaced as well, since they would prob go in the very near future. I want to say it cost me about $150-$180 total, including s/h, and had it back in a week or so. It retained my original odometer reading as well, which I was very curious/cautious of.....
Good luck.

Review the section ZJ-Secc-8E-Instrument-Cluster-and-Gauges in the page 8E-5 you can find the graphics about this work.

Good luck!!!

Problem number one. The circuit that powers up your data link connector (where you plug the code reader into) is the cigarette lighter fuse. Check that fuse to make sure it is not blown. Second problem: You more than likely need to replace your instrument panel cluster.

you have probably blown some fuses, remove and replace. check your relays too. Probably caused by putting jump lead from negative to positive or vise versa.

there is a plug on the back of cigarette lighter. it has two wires. it could possibly be unplugged. test it there. it should have the positive wire in the center and ground on the outside. the cigarette lighter receptacles go out sometimes and can be replaced if you have voltage in wires but plug in doesn't work.

First of all, you had a short in the electric system that included your cigarette lighter. When you saw the spark, you saw the result of a short. What you are experiencing now is a bad ground in the system.

This is what we refer to as stray voltage, which is why your lights are staying on. This is not aa fuse problem. If you haven't unplugged your cigarette lighter, do so. You are going to need the services of an automotive electrian to solve this problem. The reason your cigarette lighter may have been unplugged is that someone else knew of the existing problem.
Bill